our colonial life segment reported an increase in segment operating income of 1.6 percent in 2012 compared to 2011 , with higher operating revenue partially offset by less favorable risk results and higher amortization of deferred acquisition costs . premium income grew 5.2 percent in 2012 compared to 2011. the benefit ratio for colonial life was 52.5 percent in 2012 compared to 51.9 percent in 2011 due to less favorable risk results in the life and cancer and critical illness lines of business , partially offset by a more favorable benefit ratio for the accident , sickness , and disability line of business . colonial life sales decreased 1.1 percent in 2012 compared to 2011 , with a slight increase in core commercial market segment sales , which we define as accounts with fewer than 1,000 lives , offset by declines in large case commercial market segment sales and sales in the public sector market . persistency continues to be strong and was higher for all product lines in 2012 compared to 2011 . 30 our closed block segment reported a decrease in segment operating income of 22.9 percent in 2012 relative to 2011 , excluding the charges discussed in `` 2011 long-term care review and individual disability closed block reserves `` contained herein in item 7. also excluding these charges , individual disability risk results were favorable compared to 2011 due to higher claim recovery rates and a decrease in reserves for existing claims , while long-term care risk results were unfavorable compared to the prior year due to higher claim incidence rates , partially offset by higher claim resolutions . our investment portfolio continues to perform well , although our net investment income declined slightly in 2012 compared to 2011 , primarily due to a decline in yield in invested assets as we continue to invest new cash flows at lower rates . our asset quality remains strong , with a net unrealized gain on our fixed maturity securities of $ 7.2 billion at december 31 , 2012 , compared to $ 5.8 billion at december 31 , 2011. we believe our capital and financial positions are strong . at december 31 , 2012 , the risk-based capital ( rbc ) ratio for our traditional u.s. insurance subsidiaries , calculated on a weighted average basis using the naic company action level formula , was approximately 396 percent , compared to 405 percent at december 31 , 2011. the decline relative to 2011 results primarily from higher levels of capital required to support our business growth , but our rbc ratio at year end 2012 is within our target range of 375 percent to 400 percent . our leverage ratio , when calculated using consolidated debt to total consolidated capital , was 30.4 percent at december 31 , 2012 , compared to 28.7 percent at december 31 , 2011. the increase was due to the august 2012 issuance of $ 250.0 million of senior notes and the increase in short-term debt related to securities lending agreements outstanding , partially offset by our 2012 principal payments on the debt of northwind holdings , llc ( northwind holdings ) and tailwind holdings , llc ( tailwind holdings ) . our leverage ratio , when calculated excluding the non-recourse debt and associated capital of northwind holdings and tailwind holdings and the short-term debt arising from securities lending agreements , was 25.3 percent at december 31 , 2012 , compared to 23.5 percent at december 31 , 2011. cash equivalents and marketable securities held at unum group and our other intermediate holding companies are a significant source of liquidity for us and were approximately $ 805 million and $ 756 million at december 31 , 2012 and 2011 , respectively . further discussion is included in `` consolidated operating results , `` `` reconciliation of non-gaap financial measures , `` `` segment results , `` `` investments , `` and `` liquidity and capital resources `` contained in this item 7. outlook for 2013 we anticipate the general environment for 2013 to be similar to 2012 , with below-average economic growth and a continuation of low interest rates . while the environment will remain challenging , the need for our products and services remains strong . we believe we are taking the needed actions to protect our solid margins and returns and the impact of our pricing and risk actions will likely not have a favorable impact on our financial results until 2014 and beyond . while we anticipate that our 2013 operating growth will be below our long-term targets , we currently believe that our per diluted common share after-tax operating income growth will be neutral to positive relative to the level of 2012. during 2013 , we intend to remain focused on disciplined top-line growth in select markets , continued effectiveness in our operating performance , and a consistent , sustainable capital generation and deployment strategy . we continue to believe that our strategy of delivering a broad set of financial protection choices to employees while also enabling employers to define their financial contribution in support of those choices should enable us to continue in a leadership position in our markets over the long term . 2011 long-term care review and individual disability closed block reserves long-term care strategic review following a comprehensive and strategic review of our long-term care business , in february 2012 we announced that we would discontinue selling group long-term care . we discontinued selling individual long-term care during 2009. because both group and individual long-term care are considered closed blocks of business , effective december 31 , 2011 , we reclassified our long-term care products from the unum us segment to the closed block segment . story_separator_special_tag for unum us group short-term disability products , an estimate of the value of future payments to be made on claims already submitted , as well as ibnr claims , is determined in aggregate rather than on the individual claimant basis that we use for our long-term products , using historical patterns of claim incidence as well as historical patterns of aggregate claim resolution rates . the average length of time between the event triggering a claim under a policy and the final resolution of those claims is much shorter for these products than for our long-term liabilities and results in less estimation variability . 34 claim reserves supporting the unum us group life and accidental death and dismemberment products represent approximately 3.9 percent of our total claim reserves at december 31 , 2012. claim reserves for these products are related primarily to death claims reported but not yet paid , ibnr death claims , and a liability for waiver of premium benefits . the death claim reserve is based on the actual face amount to be paid , the ibnr reserve is calculated using the count and severity method , and the waiver of premium benefits reserve is calculated using the tabular reserve methodology . claim reserves supporting our unum uk segment represent approximately 9.7 percent of our total claim reserves at december 31 , 2012 , and are calculated using generally the same methodology that we use for unum us disability and group life reserves . the assumptions used in calculating claim reserves for this line of business are based on standard united kingdom industry experience , adjusted for unum uk 's own experience . the majority of the colonial life segment lines of business have short-term benefits , which generally have less estimation variability than our long-term products because of the shorter claim payout period . our claim reserves for colonial life 's lines of business , which approximate 1.4 percent of our total claim reserves at december 31 , 2012 , are predominantly determined using the incurred loss development method based on our own experience . the incurred loss development method uses the historical patterns of payments by loss date to predict future claim payments for each loss date . where the incurred loss development method may not be appropriate , we estimate the incurred claims using an expected claim cost per policy or other measure of exposure . the key assumptions for claim reserves for the colonial life lines of business are : ( 1 ) the timing , rate , and amount of estimated future claim payments ; and ( 2 ) the estimated expenses associated with the payment of claims . the following table displays policy reserves , incurred claim reserves , and ibnr claim reserves by major product line , with the summation of the policy reserves and claim reserves shown both gross and net of the associated reinsurance recoverable . incurred claim reserves represent reserves determined for each incurred claim and also include estimated amounts for litigation expenses and other expenses associated with the payment of the claims as well as provisions for claims which we estimate will be reopened for our long-term care products . ibnr claim reserves include provisions for incurred but not reported claims and a provision for reopened claims for our disability products . the ibnr and reopened claim reserves for our disability products are developed and maintained in aggregate based on historical monitoring that has only been on a combined basis . replace_table_token_4_th 35 replace_table_token_5_th key assumptions the calculation of policy and claim reserves involves numerous assumptions , but the primary assumptions used to calculate reserves are ( 1 ) the discount rate , ( 2 ) the claim resolution rate , and ( 3 ) the claim incidence rate for policy reserves and ibnr claim reserves . of these assumptions , our discount rate and claim resolution rate assumptions have historically had the most significant effects on our level of reserves because many of our product lines provide benefit payments over an extended period of time . 1. the discount rate , which is used in calculating both policy reserves and incurred and ibnr claim reserves , is the interest rate that we use to discount future claim payments to determine the present value . a higher discount rate produces a lower reserve . if the discount rate is higher than our future investment returns , our invested assets will not earn enough investment income to support our future claim payments . in this case , the reserves may eventually be insufficient . we set our assumptions based on our current and expected future investment yield of the assets supporting the reserves , considering current and expected future market conditions . if the investment yield on new investments that are purchased is below or above the investment yield of the existing investment portfolio , it is likely that the discount rate assumption on claims will be established to reflect the effect of the new investment yield . 2. the claim resolution rate , used for both policy reserves and incurred and ibnr claim reserves , is the probability that a disability or long-term care claim will close due to recovery or death of the insured . it is important because it is used to estimate how long benefits will be paid for a claim . estimated resolution rates that are set too high will result in reserves that are lower than they need to be to pay the claim benefits over time . claim resolution assumptions involve many factors , including the cause of disability , the policyholder 's age , the type of contractual benefits provided , and the time since initially becoming disabled . we primarily use our own claim experience to develop our claim resolution assumptions . these assumptions are established for the probability of death and the probability of recovery from disability . our studies review actual claim resolution experience over

issuance of debt in august 2012 , we issued $ 250.0 million of unsecured senior notes in a public offering . these notes , due 2042 , bear interest at a fixed rate of 5.75 % and are payable semi-annually . the notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt . the balance outstanding on these notes was $ 250.0 million at december 31 , 2012. in 2010 , we issued $ 400.0 million of unsecured senior notes in a public offering . these notes , due in 2020 , bear interest at a fixed rate of 5.625 % and are payable semi-annually . the notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt . in addition , these notes are effectively subordinated to any indebtedness of our subsidiaries . the balance outstanding on these notes was $ 400.0 million at december 31 , 2012. in 2009 , we issued $ 350.0 million of unsecured senior notes in a public offering . these notes , due in 2016 , bear interest at a fixed rate of 7.125 % and are payable semi-annually . the notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt . the balance outstanding on these notes was $ 350.0 million at december 31 , 2012. in 2007 , northwind holdings issued $ 800.0 million floating rate , insured , senior , secured notes , due 2037 , in a private offering . recourse for the payment of principal , interest , and other amounts due on the notes will be limited to the collateral for the notes and other assets of northwind holdings , consisting primarily of the stock of its sole subsidiary northwind re , a vermont special purpose financial captive insurance company . northwind holdings ' ability to meet its payment obligations under the notes will be dependent principally upon its receipt of dividends from northwind re .


 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.
     ```issuance of debt in august 2012 , we issued $ 250.0 million of unsecured senior notes in a public offering . these notes , due 2042 , bear interest at a fixed rate of 5.75 % and are payable semi-annually . the notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt . the balance outstanding on these notes was $ 250.0 million at december 31 , 2012. in 2010 , we issued $ 400.0 million of unsecured senior notes in a public offering . these notes , due in 2020 , bear interest at a fixed rate of 5.625 % and are payable semi-annually . the notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt . in addition , these notes are effectively subordinated to any indebtedness of our subsidiaries . the balance outstanding on these notes was $ 400.0 million at december 31 , 2012. in 2009 , we issued $ 350.0 million of unsecured senior notes in a public offering . these notes , due in 2016 , bear interest at a fixed rate of 7.125 % and are payable semi-annually . the notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt . the balance outstanding on these notes was $ 350.0 million at december 31 , 2012. in 2007 , northwind holdings issued $ 800.0 million floating rate , insured , senior , secured notes , due 2037 , in a private offering . recourse for the payment of principal , interest , and other amounts due on the notes will be limited to the collateral for the notes and other assets of northwind holdings , consisting primarily of the stock of its sole subsidiary northwind re , a vermont special purpose financial captive insurance company . northwind holdings ' ability to meet its payment obligations under the notes will be dependent principally upon its receipt of dividends from northwind re .
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 Suspicious Activity Report : our colonial life segment reported an increase in segment operating income of 1.6 percent in 2012 compared to 2011 , with higher operating revenue partially offset by less favorable risk results and higher amortization of deferred acquisition costs . premium income grew 5.2 percent in 2012 compared to 2011. the benefit ratio for colonial life was 52.5 percent in 2012 compared to 51.9 percent in 2011 due to less favorable risk results in the life and cancer and critical illness lines of business , partially offset by a more favorable benefit ratio for the accident , sickness , and disability line of business . colonial life sales decreased 1.1 percent in 2012 compared to 2011 , with a slight increase in core commercial market segment sales , which we define as accounts with fewer than 1,000 lives , offset by declines in large case commercial market segment sales and sales in the public sector market . persistency continues to be strong and was higher for all product lines in 2012 compared to 2011 . 30 our closed block segment reported a decrease in segment operating income of 22.9 percent in 2012 relative to 2011 , excluding the charges discussed in `` 2011 long-term care review and individual disability closed block reserves `` contained herein in item 7. also excluding these charges , individual disability risk results were favorable compared to 2011 due to higher claim recovery rates and a decrease in reserves for existing claims , while long-term care risk results were unfavorable compared to the prior year due to higher claim incidence rates , partially offset by higher claim resolutions . our investment portfolio continues to perform well , although our net investment income declined slightly in 2012 compared to 2011 , primarily due to a decline in yield in invested assets as we continue to invest new cash flows at lower rates . our asset quality remains strong , with a net unrealized gain on our fixed maturity securities of $ 7.2 billion at december 31 , 2012 , compared to $ 5.8 billion at december 31 , 2011. we believe our capital and financial positions are strong . at december 31 , 2012 , the risk-based capital ( rbc ) ratio for our traditional u.s. insurance subsidiaries , calculated on a weighted average basis using the naic company action level formula , was approximately 396 percent , compared to 405 percent at december 31 , 2011. the decline relative to 2011 results primarily from higher levels of capital required to support our business growth , but our rbc ratio at year end 2012 is within our target range of 375 percent to 400 percent . our leverage ratio , when calculated using consolidated debt to total consolidated capital , was 30.4 percent at december 31 , 2012 , compared to 28.7 percent at december 31 , 2011. the increase was due to the august 2012 issuance of $ 250.0 million of senior notes and the increase in short-term debt related to securities lending agreements outstanding , partially offset by our 2012 principal payments on the debt of northwind holdings , llc ( northwind holdings ) and tailwind holdings , llc ( tailwind holdings ) . our leverage ratio , when calculated excluding the non-recourse debt and associated capital of northwind holdings and tailwind holdings and the short-term debt arising from securities lending agreements , was 25.3 percent at december 31 , 2012 , compared to 23.5 percent at december 31 , 2011. cash equivalents and marketable securities held at unum group and our other intermediate holding companies are a significant source of liquidity for us and were approximately $ 805 million and $ 756 million at december 31 , 2012 and 2011 , respectively . further discussion is included in `` consolidated operating results , `` `` reconciliation of non-gaap financial measures , `` `` segment results , `` `` investments , `` and `` liquidity and capital resources `` contained in this item 7. outlook for 2013 we anticipate the general environment for 2013 to be similar to 2012 , with below-average economic growth and a continuation of low interest rates . while the environment will remain challenging , the need for our products and services remains strong . we believe we are taking the needed actions to protect our solid margins and returns and the impact of our pricing and risk actions will likely not have a favorable impact on our financial results until 2014 and beyond . while we anticipate that our 2013 operating growth will be below our long-term targets , we currently believe that our per diluted common share after-tax operating income growth will be neutral to positive relative to the level of 2012. during 2013 , we intend to remain focused on disciplined top-line growth in select markets , continued effectiveness in our operating performance , and a consistent , sustainable capital generation and deployment strategy . we continue to believe that our strategy of delivering a broad set of financial protection choices to employees while also enabling employers to define their financial contribution in support of those choices should enable us to continue in a leadership position in our markets over the long term . 2011 long-term care review and individual disability closed block reserves long-term care strategic review following a comprehensive and strategic review of our long-term care business , in february 2012 we announced that we would discontinue selling group long-term care . we discontinued selling individual long-term care during 2009. because both group and individual long-term care are considered closed blocks of business , effective december 31 , 2011 , we reclassified our long-term care products from the unum us segment to the closed block segment . story_separator_special_tag for unum us group short-term disability products , an estimate of the value of future payments to be made on claims already submitted , as well as ibnr claims , is determined in aggregate rather than on the individual claimant basis that we use for our long-term products , using historical patterns of claim incidence as well as historical patterns of aggregate claim resolution rates . the average length of time between the event triggering a claim under a policy and the final resolution of those claims is much shorter for these products than for our long-term liabilities and results in less estimation variability . 34 claim reserves supporting the unum us group life and accidental death and dismemberment products represent approximately 3.9 percent of our total claim reserves at december 31 , 2012. claim reserves for these products are related primarily to death claims reported but not yet paid , ibnr death claims , and a liability for waiver of premium benefits . the death claim reserve is based on the actual face amount to be paid , the ibnr reserve is calculated using the count and severity method , and the waiver of premium benefits reserve is calculated using the tabular reserve methodology . claim reserves supporting our unum uk segment represent approximately 9.7 percent of our total claim reserves at december 31 , 2012 , and are calculated using generally the same methodology that we use for unum us disability and group life reserves . the assumptions used in calculating claim reserves for this line of business are based on standard united kingdom industry experience , adjusted for unum uk 's own experience . the majority of the colonial life segment lines of business have short-term benefits , which generally have less estimation variability than our long-term products because of the shorter claim payout period . our claim reserves for colonial life 's lines of business , which approximate 1.4 percent of our total claim reserves at december 31 , 2012 , are predominantly determined using the incurred loss development method based on our own experience . the incurred loss development method uses the historical patterns of payments by loss date to predict future claim payments for each loss date . where the incurred loss development method may not be appropriate , we estimate the incurred claims using an expected claim cost per policy or other measure of exposure . the key assumptions for claim reserves for the colonial life lines of business are : ( 1 ) the timing , rate , and amount of estimated future claim payments ; and ( 2 ) the estimated expenses associated with the payment of claims . the following table displays policy reserves , incurred claim reserves , and ibnr claim reserves by major product line , with the summation of the policy reserves and claim reserves shown both gross and net of the associated reinsurance recoverable . incurred claim reserves represent reserves determined for each incurred claim and also include estimated amounts for litigation expenses and other expenses associated with the payment of the claims as well as provisions for claims which we estimate will be reopened for our long-term care products . ibnr claim reserves include provisions for incurred but not reported claims and a provision for reopened claims for our disability products . the ibnr and reopened claim reserves for our disability products are developed and maintained in aggregate based on historical monitoring that has only been on a combined basis . replace_table_token_4_th 35 replace_table_token_5_th key assumptions the calculation of policy and claim reserves involves numerous assumptions , but the primary assumptions used to calculate reserves are ( 1 ) the discount rate , ( 2 ) the claim resolution rate , and ( 3 ) the claim incidence rate for policy reserves and ibnr claim reserves . of these assumptions , our discount rate and claim resolution rate assumptions have historically had the most significant effects on our level of reserves because many of our product lines provide benefit payments over an extended period of time . 1. the discount rate , which is used in calculating both policy reserves and incurred and ibnr claim reserves , is the interest rate that we use to discount future claim payments to determine the present value . a higher discount rate produces a lower reserve . if the discount rate is higher than our future investment returns , our invested assets will not earn enough investment income to support our future claim payments . in this case , the reserves may eventually be insufficient . we set our assumptions based on our current and expected future investment yield of the assets supporting the reserves , considering current and expected future market conditions . if the investment yield on new investments that are purchased is below or above the investment yield of the existing investment portfolio , it is likely that the discount rate assumption on claims will be established to reflect the effect of the new investment yield . 2. the claim resolution rate , used for both policy reserves and incurred and ibnr claim reserves , is the probability that a disability or long-term care claim will close due to recovery or death of the insured . it is important because it is used to estimate how long benefits will be paid for a claim . estimated resolution rates that are set too high will result in reserves that are lower than they need to be to pay the claim benefits over time . claim resolution assumptions involve many factors , including the cause of disability , the policyholder 's age , the type of contractual benefits provided , and the time since initially becoming disabled . we primarily use our own claim experience to develop our claim resolution assumptions . these assumptions are established for the probability of death and the probability of recovery from disability . our studies review actual claim resolution experience over

