Business Acquisitions, Goodwill and Other Intangible Assets GEODynamics Acquisition On January 12, 2018, the Company acquired GEODynamics, Inc. ("GEODynamics"), which provides oil and gas perforation systems and downhole tools in support of completion, intervention, wireline and well abandonment operations (the GEODynamics Acquisition). Total purchase price consideration was $615.3 million , consisting of (i) $295.4 million in cash (net of cash acquired), which was funded through borrowings under the Company's Revolving Credit Facility (as defined in Note 6 , "Long-term Debt"), (ii) approximately 8.66 million shares of the Company's common stock (having a market value of approximately $295 million as of the closing date of the acquisition) and (iii) an unsecured $25 million promissory note that bears interest at 2.5% per annum and is scheduled to mature on July 12, 2019. Under the terms of the purchase agreement, the Company may be entitled to indemnification in respect of certain matters occurring prior to the acquisition and payments due under the promissory note may be subject to set-off, in part or in full, regarding such indemnified matters. See Note 14 , "Commitments and Contingencies." GEODynamics results of operations have been included in the Companys financial statements subsequent to the closing of the acquisition on January 12, 2018. The acquired GEODynamics operations are reported as the Downhole Technologies segment. See Note 13 , "Segments and Related Information" for further information with respect to the Downhole Technologies segment operations. Falcon Acquisition On February 28, 2018, the Company acquired Falcon Flowback Services, LLC (Falcon), a full service provider of flowback and well testing services for the separation and recovery of fluids, solid debris and proppant used during hydraulic fracturing operations. Falcon provides additional scale and diversity to our Completion Services well testing operations in key shale plays in the United States. The purchase price was $84.2 million (net of cash acquired). The Falcon acquisition was funded by borrowings under the Company's Revolving Credit Facility. Under the terms of the purchase agreement, the Company may be entitled to indemnification in respect of certain matters occurring prior to acquisition. Falcons results of operations have been included in the Companys financial statements and has been reported within the Completion Services business subsequent to the closing of the acquisition on February 28, 2018. Transaction-Related Costs During the three months ended March 31, 2018 , the Company expensed transaction-related costs of $2.6 million , which are included within selling, general and administrative expense and within other operating income. No material transaction-related costs were incurred during the three months ended March 31, 2019 . Supplemental Unaudited Pro Forma Financial Information The following supplemental unaudited pro forma results of operations data for the three months ended March 31, 2018 gives pro forma effect to the consummation of the GEODynamics and Falcon acquisitions as if they had occurred on January 1, 2018. The supplemental unaudited pro forma financial information was prepared based on historical financial information, adjusted to give pro forma effect to fair value adjustments on depreciation and amortization expense, interest expense, and related tax effects, among others. The pro forma results for the three months ended March 31, 2018 also reflect adjustments to exclude the after-tax impact of transaction costs of $2.0 million . The supplemental unaudited pro forma financial information may not reflect what the results of the combined operations would have been had the acquisitions occurred on January 1, 2018. As such, it is presented for informational purposes only (in thousands, except per share amount). Three Months Ended March 31, 2018 Revenue $ 280,200 Net loss $ (992 ) Diluted net loss per share $ (0.02 ) Diluted weighted average common shares outstanding 58,811 Goodwill Changes in the carrying amount of goodwill for the three -month period ended March 31, 2019 were as follows (in thousands): Well Site Services Downhole Technologies Offshore/ Manufactured Products Total Completion Services Drilling Services Subtotal Balance as of December 31, 2018 Goodwill $ 221,582 $ 22,767 $ 244,349 $ 357,502 $ 162,462 $ 764,313 Accumulated impairment losses (94,528 ) (22,767 ) (117,295 )   (117,295 ) 127,054  127,054 357,502 162,462 647,018 Foreign currency translation     167 167 Balance as of March 31, 2019 $ 127,054 $  $ 127,054 $ 357,502 $ 162,629 $ 647,185 Balance as of March 31, 2019 Goodwill $ 221,582 $ 22,767 $ 244,349 $ 357,502 $ 162,629 $ 764,480 Accumulated impairment losses (94,528 ) (22,767 ) (117,295 )   (117,295 ) $ 127,054 $  $ 127,054 $ 357,502 $ 162,629 $ 647,185 Other Intangible Assets The following table presents the total gross carrying amount of intangibles and the total accumulated amortization for major intangible asset classes as of March 31, 2019 and December 31, 2018 (in thousands): March 31, 2019 December 31, 2018 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Other intangible assets: Customer relationships $ 167,811 $ 35,980 $ 167,811 $ 33,247 Patents/Technology/Know-how 85,223 25,336 84,903 23,418 Noncompete agreements 17,616 7,729 18,705 7,544 Tradenames and other 53,709 6,403 53,708 5,617 Total other intangible assets $ 324,359 $ 75,448 $ 325,127 $ 69,826 Amortization expense was $6.7 million and $5.6 million for the three months ended March 31, 2019 and 2018 , respectively.