under the asr , we made an up-front payment of $ 200.0 million and received an initial delivery of 6.4 million shares for an aggregate price of $ 160.0 million . upon completion of the asr in the first quarter of 2020 , we received an additional 1.8 million shares from the financial institution . these 1.8 million shares will be retired in the first quarter of 2020. the completion of the asr resulted in a total settlement of 8.2 million shares of our common stock at a volume weighted average repurchase price , less an agreed upon discount , of $ 24.44 per share . during 2019 , we also paid quarterly dividends of $ 0.19 per share , for an aggregate amount of $ 260.1 million . dso : dso is calculated as the ratio of ending accounts receivable , net of allowances , divided by average daily net revenues for the preceding 90 days . dso increased , primarily due to higher accounts receivable resulting from higher overall invoicing volume . deferred revenue : total deferred revenue increased , primarily due to the timing of the delivery of contractual commitments . critical accounting policies and estimates the preparation of the financial statements and related disclosures in conformity with u.s. gaap requires us to make judgments , assumptions , and estimates that affect the amounts reported in the consolidated financial statements and the accompanying notes . on an ongoing basis , we evaluate our estimates , including those related to sales returns , pricing credits , warranty costs , allowance for doubtful accounts , impairment of long-term assets , especially goodwill and intangible assets , contract manufacturer liabilities , assumptions used in the valuation of share-based compensation , and litigation . we base our estimates and assumptions on current facts , historical experience , and various other factors that we believe are reasonable under the circumstances , the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources . for further information about our significant accounting policies , see note 2 , significant accounting policies , in notes to consolidated financial statements in item 8 of part ii of this report , which describes the significant accounting policies and methods used in the preparation of the consolidated financial statements . the accounting policies described below are significantly affected by critical accounting estimates . such accounting policies require significant judgments , assumptions , and estimates used in the preparation of the consolidated financial statements and actual results could differ materially from the amounts reported based on these policies . to the extent there are material differences between our estimates and the actual results , our future consolidated results of operations may be affected . goodwill and purchased intangible assets : we make significant estimates , assumptions , and judgments when valuing goodwill and other intangible assets in connection with the initial purchase price allocation of an acquired entity , as well as when evaluating impairment of goodwill and other intangible assets on an ongoing basis . the purchase price of an acquired entity is allocated between intangible assets and the net tangible assets of the acquired business with the residual of the purchase price recorded as goodwill . the determination of the value of the intangible assets acquired involves certain judgments and estimates . critical estimates include , but are not limited to , historical and projected customer retention rates , anticipated growth in revenue from the acquired customer and product base , and the expected use of the acquired assets . these factors are also considered in determining the useful life of the acquired intangible assets . these estimates are based upon a number of factors , including historical experience , market conditions , and information obtained from the management of the acquired company . these judgments can include , but are not limited to , the cash flows that an asset is expected to generate in future periods and the appropriate weighted average cost of capital . goodwill represents the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recorded . we evaluate goodwill for impairment on an annual basis , as of november 1 st , or more frequently if an event occurs or facts and circumstances change that would more likely than not reduce the fair value of our reporting units below their carrying amount . goodwill is tested for impairment at the reporting unit level , which is one level below the operating segment , by first performing a qualitative assessment to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying value . if the reporting unit does not pass the qualitative assessment , then the reporting unit 's carrying value is compared to its fair value . if the fair value of the reporting unit exceeds the carrying value of the reporting unit , goodwill is not impaired and no further testing is required . if the fair value of the reporting unit does not exceed the carrying value , we perform 44 the second step of the impairment test . goodwill is considered impaired if the carrying value of the reporting unit exceeds its fair value . the fair values of the reporting units are estimated using market and discounted cash flow approaches . the discounted cash flow approach uses expected future operating results . the market approach uses comparable company information to determine revenue and earnings multiples to value our reporting units . failure to achieve these expected results or market multiples may cause a future impairment of goodwill of our reporting units . story_separator_special_tag interest expense interest expense decreased $ 14.5 million primarily due to a reduction in total debt primarily from the repayment in february 2019 , of our 3.125 % senior notes for an aggregate principal amount of $ 350.0 million , and from the repayment in august 2019 , of our 3.300 % and 4.600 % senior notes due in 2020 and 2021 , respectively , for an aggregate principal amount of $ 600.0 million . the decrease in interest expense was partially offset by the issuance of our 3.75 % senior notes due 2029 for an aggregate principal amount of $ 500.0 million in august 2019. loss on extinguishment of debt during the year ended december 31 , 2019 , we incurred a call premium related to the early repayment of our 2020 and 2021 senior notes , conversely there were no such charges recorded in 2018 . loss on investments , net during the year ended december 31 , 2019 , our loss on investments decreased primarily related to certain equity investments in privately-held companies . 50 income tax provision ( benefit ) the following table presents the income tax provision ( benefit ) ( in millions , except percentages ) : replace_table_token_11_th the effective tax rate for fiscal year 2019 was higher than 2018 , primarily due to the net difference in discrete items unique to fiscal year 2019 compared to fiscal year 2018. in 2019 , our effective rate included a $ 25.4 million benefit , including interest , related to the recognition of previously unrecognized tax benefits pursuant to the resolution of a tax audit and a $ 7.5 million benefit , including interest , for a lapse in statute of limitations . the 2018 rate reflected a $ 67.6 million benefit , including interest , related to a lapse in statute of limitations , a $ 33.2 million benefit as a result of filing a change in tax accounting method for the recognition of deferred product revenue , and a $ 32.2 million benefit resulting from a tax accounting method change related to foreign deferred service revenue . for a complete reconciliation of our effective tax rate to the u.s. federal statutory rate of 21 % and further explanation of our income tax provision , see note 14 , income taxes , in the notes to consolidated financial statements in item 8 of part ii of this report . on june 7 , 2019 , the ninth circuit court of appeals , or the court , issued an opinion in altera corp. v. commissioner requiring related parties in an intercompany cost-sharing arrangement to share expenses related to share-based compensation . altera appealed this decision to the u.s. supreme court on february 10 , 2020. pending final resolution of the altera case , the company 's position on cost-sharing of share-based compensation remains unchanged . we will continue to monitor ongoing developments and potential financial statement impacts . if a judicial decision against altera had been finalized in the reporting period , our effective tax rate for 2019 would have been higher . our effective tax rate may fluctuate significantly on a quarterly basis and may be adversely affected to the extent earnings are lower than anticipated in countries that have lower statutory rates and higher than anticipated in countries that have higher statutory rates . our effective tax rate may also fluctuate due to changes in the valuation of our deferred tax assets or liabilities , or by changes in tax laws , regulations , or accounting principles , as well as certain discrete items . see item 1a of part i , `` risk factors `` of this report for a description of relevant risks which may adversely affect our results . as a result of recommendations by the oecd on base erosion and profit shifting , certain countries in emea and apac have either enacted new corporate tax legislation or are considering enacting such legislation in the near future . we expect the effect of these reform measures to potentially impact long-standing tax principles , particularly in regards to transfer pricing . consequently , we expect global tax authorities to increasingly challenge our cost sharing and other intercompany arrangements , and the related sourcing of taxable profits in global jurisdictions . 51 liquidity and capital resources the following sections discuss the effects of changes in our balance sheet , our capital return strategy , including our stock repurchase program and dividends , our contractual obligations , and certain other commitments and activities on our liquidity and capital resources . we have funded our business primarily through our operating activities and the issuance of our long-term debt . the following table presents our capital resources ( in millions , except percentages ) : replace_table_token_12_th summary of cash flows the following table summarizes cash flow activity from our consolidated statements of cash flows ( in millions , except percentages ) : replace_table_token_13_th operating activities our primary source of operating cash flows is cash collections from our customers . our primary uses of cash from operating activities are for personnel-related expenditures , payments for suppliers and other general operating expenses , as well as payments related to taxes , interest , and facilities . net cash provided by operations decreased primarily due to lower revenues and lower collections , partially offset by lower cash payments for income taxes and to suppliers . investing activities investing cash flows consist primarily of capital expenditures ; purchases , sales , maturities , and redemptions of investments ; and cash used for business combinations . story_separator_special_tag ” ) . as of december 31 , 2019 , we had $ 127.4 million included in long-term income taxes payable in the consolidated balance sheets for unrecognized tax positions . at this time , we are unable to make a reasonably reliable estimate of the timing of payments related to this amount due to uncertainties in the timing of tax audit outcomes .

net cash used in investing activities was $ 528.2 million in 2019 , compared to net cash provided by investing activities of $ 564.8 million in 2018. in 2019 , the payment for the acquisition of mist was $ 270.9 million and net purchases of investments was $ 140.4 million . in 2018 , net proceeds from sales , maturities and redemptions of investments was $ 771.3 million , primarily to fund the stock repurchases discussed below . 52 financing activities financing cash flows consist primarily of repurchases and retirement of common stock , payment of cash dividends to stockholders , issuance and repayment of long-term debt , and proceeds from the issuance of shares of common stock through employee equity incentive plans . net cash used in financing activities increased in 2019 , compared to 2018 . the 2019 payments were primarily comprised of $ 454.8 million net repayments of debt , payments of $ 550.0 million under the 2018 stock repurchase program and $ 260.1 million payments of dividends . the 2018 payments were primarily comprised of $ 750.0 million under the 2018 stock repurchase program and $ 249.3 million payments of dividends . capital return the following table summarizes our dividends paid and stock repurchase activities ( in millions , except per share amounts ) : replace_table_token_14_th _ ( 1 ) $ 25.36 average price per share for 2019 excludes the $ 40.0 million covered by the forward contract discussed below . in january 2018 , our board of directors , which we refer to as the board , approved a $ 2.0 billion share repurchase program , which we refer to as the 2018 stock repurchase program . in october 2019 , the board authorized a $ 1.0 billion increase to the 2018 stock repurchase program for a total of $ 3.0 billion . as part of the 2018 stock repurchase program , in february 2018 and april 2019 , we entered into two accelerated share repurchase programs ( the `` asr '' ) and repurchased $ 750.0 million and $ 300.0 million of our common stock , respectively .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```net cash used in investing activities was $ 528.2 million in 2019 , compared to net cash provided by investing activities of $ 564.8 million in 2018. in 2019 , the payment for the acquisition of mist was $ 270.9 million and net purchases of investments was $ 140.4 million . in 2018 , net proceeds from sales , maturities and redemptions of investments was $ 771.3 million , primarily to fund the stock repurchases discussed below . 52 financing activities financing cash flows consist primarily of repurchases and retirement of common stock , payment of cash dividends to stockholders , issuance and repayment of long-term debt , and proceeds from the issuance of shares of common stock through employee equity incentive plans . net cash used in financing activities increased in 2019 , compared to 2018 . the 2019 payments were primarily comprised of $ 454.8 million net repayments of debt , payments of $ 550.0 million under the 2018 stock repurchase program and $ 260.1 million payments of dividends . the 2018 payments were primarily comprised of $ 750.0 million under the 2018 stock repurchase program and $ 249.3 million payments of dividends . capital return the following table summarizes our dividends paid and stock repurchase activities ( in millions , except per share amounts ) : replace_table_token_14_th _ ( 1 ) $ 25.36 average price per share for 2019 excludes the $ 40.0 million covered by the forward contract discussed below . in january 2018 , our board of directors , which we refer to as the board , approved a $ 2.0 billion share repurchase program , which we refer to as the 2018 stock repurchase program . in october 2019 , the board authorized a $ 1.0 billion increase to the 2018 stock repurchase program for a total of $ 3.0 billion . as part of the 2018 stock repurchase program , in february 2018 and april 2019 , we entered into two accelerated share repurchase programs ( the `` asr '' ) and repurchased $ 750.0 million and $ 300.0 million of our common stock , respectively .
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 Suspicious Activity Report : under the asr , we made an up-front payment of $ 200.0 million and received an initial delivery of 6.4 million shares for an aggregate price of $ 160.0 million . upon completion of the asr in the first quarter of 2020 , we received an additional 1.8 million shares from the financial institution . these 1.8 million shares will be retired in the first quarter of 2020. the completion of the asr resulted in a total settlement of 8.2 million shares of our common stock at a volume weighted average repurchase price , less an agreed upon discount , of $ 24.44 per share . during 2019 , we also paid quarterly dividends of $ 0.19 per share , for an aggregate amount of $ 260.1 million . dso : dso is calculated as the ratio of ending accounts receivable , net of allowances , divided by average daily net revenues for the preceding 90 days . dso increased , primarily due to higher accounts receivable resulting from higher overall invoicing volume . deferred revenue : total deferred revenue increased , primarily due to the timing of the delivery of contractual commitments . critical accounting policies and estimates the preparation of the financial statements and related disclosures in conformity with u.s. gaap requires us to make judgments , assumptions , and estimates that affect the amounts reported in the consolidated financial statements and the accompanying notes . on an ongoing basis , we evaluate our estimates , including those related to sales returns , pricing credits , warranty costs , allowance for doubtful accounts , impairment of long-term assets , especially goodwill and intangible assets , contract manufacturer liabilities , assumptions used in the valuation of share-based compensation , and litigation . we base our estimates and assumptions on current facts , historical experience , and various other factors that we believe are reasonable under the circumstances , the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources . for further information about our significant accounting policies , see note 2 , significant accounting policies , in notes to consolidated financial statements in item 8 of part ii of this report , which describes the significant accounting policies and methods used in the preparation of the consolidated financial statements . the accounting policies described below are significantly affected by critical accounting estimates . such accounting policies require significant judgments , assumptions , and estimates used in the preparation of the consolidated financial statements and actual results could differ materially from the amounts reported based on these policies . to the extent there are material differences between our estimates and the actual results , our future consolidated results of operations may be affected . goodwill and purchased intangible assets : we make significant estimates , assumptions , and judgments when valuing goodwill and other intangible assets in connection with the initial purchase price allocation of an acquired entity , as well as when evaluating impairment of goodwill and other intangible assets on an ongoing basis . the purchase price of an acquired entity is allocated between intangible assets and the net tangible assets of the acquired business with the residual of the purchase price recorded as goodwill . the determination of the value of the intangible assets acquired involves certain judgments and estimates . critical estimates include , but are not limited to , historical and projected customer retention rates , anticipated growth in revenue from the acquired customer and product base , and the expected use of the acquired assets . these factors are also considered in determining the useful life of the acquired intangible assets . these estimates are based upon a number of factors , including historical experience , market conditions , and information obtained from the management of the acquired company . these judgments can include , but are not limited to , the cash flows that an asset is expected to generate in future periods and the appropriate weighted average cost of capital . goodwill represents the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recorded . we evaluate goodwill for impairment on an annual basis , as of november 1 st , or more frequently if an event occurs or facts and circumstances change that would more likely than not reduce the fair value of our reporting units below their carrying amount . goodwill is tested for impairment at the reporting unit level , which is one level below the operating segment , by first performing a qualitative assessment to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying value . if the reporting unit does not pass the qualitative assessment , then the reporting unit 's carrying value is compared to its fair value . if the fair value of the reporting unit exceeds the carrying value of the reporting unit , goodwill is not impaired and no further testing is required . if the fair value of the reporting unit does not exceed the carrying value , we perform 44 the second step of the impairment test . goodwill is considered impaired if the carrying value of the reporting unit exceeds its fair value . the fair values of the reporting units are estimated using market and discounted cash flow approaches . the discounted cash flow approach uses expected future operating results . the market approach uses comparable company information to determine revenue and earnings multiples to value our reporting units . failure to achieve these expected results or market multiples may cause a future impairment of goodwill of our reporting units . story_separator_special_tag interest expense interest expense decreased $ 14.5 million primarily due to a reduction in total debt primarily from the repayment in february 2019 , of our 3.125 % senior notes for an aggregate principal amount of $ 350.0 million , and from the repayment in august 2019 , of our 3.300 % and 4.600 % senior notes due in 2020 and 2021 , respectively , for an aggregate principal amount of $ 600.0 million . the decrease in interest expense was partially offset by the issuance of our 3.75 % senior notes due 2029 for an aggregate principal amount of $ 500.0 million in august 2019. loss on extinguishment of debt during the year ended december 31 , 2019 , we incurred a call premium related to the early repayment of our 2020 and 2021 senior notes , conversely there were no such charges recorded in 2018 . loss on investments , net during the year ended december 31 , 2019 , our loss on investments decreased primarily related to certain equity investments in privately-held companies . 50 income tax provision ( benefit ) the following table presents the income tax provision ( benefit ) ( in millions , except percentages ) : replace_table_token_11_th the effective tax rate for fiscal year 2019 was higher than 2018 , primarily due to the net difference in discrete items unique to fiscal year 2019 compared to fiscal year 2018. in 2019 , our effective rate included a $ 25.4 million benefit , including interest , related to the recognition of previously unrecognized tax benefits pursuant to the resolution of a tax audit and a $ 7.5 million benefit , including interest , for a lapse in statute of limitations . the 2018 rate reflected a $ 67.6 million benefit , including interest , related to a lapse in statute of limitations , a $ 33.2 million benefit as a result of filing a change in tax accounting method for the recognition of deferred product revenue , and a $ 32.2 million benefit resulting from a tax accounting method change related to foreign deferred service revenue . for a complete reconciliation of our effective tax rate to the u.s. federal statutory rate of 21 % and further explanation of our income tax provision , see note 14 , income taxes , in the notes to consolidated financial statements in item 8 of part ii of this report . on june 7 , 2019 , the ninth circuit court of appeals , or the court , issued an opinion in altera corp. v. commissioner requiring related parties in an intercompany cost-sharing arrangement to share expenses related to share-based compensation . altera appealed this decision to the u.s. supreme court on february 10 , 2020. pending final resolution of the altera case , the company 's position on cost-sharing of share-based compensation remains unchanged . we will continue to monitor ongoing developments and potential financial statement impacts . if a judicial decision against altera had been finalized in the reporting period , our effective tax rate for 2019 would have been higher . our effective tax rate may fluctuate significantly on a quarterly basis and may be adversely affected to the extent earnings are lower than anticipated in countries that have lower statutory rates and higher than anticipated in countries that have higher statutory rates . our effective tax rate may also fluctuate due to changes in the valuation of our deferred tax assets or liabilities , or by changes in tax laws , regulations , or accounting principles , as well as certain discrete items . see item 1a of part i , `` risk factors `` of this report for a description of relevant risks which may adversely affect our results . as a result of recommendations by the oecd on base erosion and profit shifting , certain countries in emea and apac have either enacted new corporate tax legislation or are considering enacting such legislation in the near future . we expect the effect of these reform measures to potentially impact long-standing tax principles , particularly in regards to transfer pricing . consequently , we expect global tax authorities to increasingly challenge our cost sharing and other intercompany arrangements , and the related sourcing of taxable profits in global jurisdictions . 51 liquidity and capital resources the following sections discuss the effects of changes in our balance sheet , our capital return strategy , including our stock repurchase program and dividends , our contractual obligations , and certain other commitments and activities on our liquidity and capital resources . we have funded our business primarily through our operating activities and the issuance of our long-term debt . the following table presents our capital resources ( in millions , except percentages ) : replace_table_token_12_th summary of cash flows the following table summarizes cash flow activity from our consolidated statements of cash flows ( in millions , except percentages ) : replace_table_token_13_th operating activities our primary source of operating cash flows is cash collections from our customers . our primary uses of cash from operating activities are for personnel-related expenditures , payments for suppliers and other general operating expenses , as well as payments related to taxes , interest , and facilities . net cash provided by operations decreased primarily due to lower revenues and lower collections , partially offset by lower cash payments for income taxes and to suppliers . investing activities investing cash flows consist primarily of capital expenditures ; purchases , sales , maturities , and redemptions of investments ; and cash used for business combinations . story_separator_special_tag ” ) . as of december 31 , 2019 , we had $ 127.4 million included in long-term income taxes payable in the consolidated balance sheets for unrecognized tax positions . at this time , we are unable to make a reasonably reliable estimate of the timing of payments related to this amount due to uncertainties in the timing of tax audit outcomes .

