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Business Segment and Entity wide Disclosures - Summary of selected information between United States and all international locations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues: |  |  |
Revenues | $ 1,222,409 | $ 1,721,005 | $ 1,595,227
Operating (loss) income: |  |  |
Operating (loss) profit | (114,288) | 210,030 | 226,217
Capital expenditures | 250,629 | 242,610 | 117,509
Depreciation and amortization | 170,409 | 163,120 | 163,537
Identifiable assets | 1,053,218 | 1,199,580 | 1,147,224
Impairment and Other Charges | 82,273 |  |
Technical Services |  |  |
Revenues: |  |  |
Revenues | 1,145,554 | 1,647,213 | 1,538,351
Operating (loss) income: |  |  |
Operating (loss) profit | (32,993) | 216,703 | 251,476
Capital expenditures | 237,950 | 230,262 | 106,131
Depreciation and amortization | 154,776 | 150,508 | 145,507
Identifiable assets | 848,264 | 925,305 | 896,803
Impairment and Other Charges | 80,263 |  |
Support Services |  |  |
Revenues: |  |  |
Revenues | 76,855 | 73,792 | 56,876
Operating (loss) income: |  |  |
Operating (loss) profit | 10,016 | 4,612 | (12,228)
Capital expenditures | 10,330 | 10,364 | 9,949
Depreciation and amortization | 15,328 | 12,174 | 17,570
Identifiable assets | 72,351 | 78,413 | 75,568
Impairment and other charges |  |  |
Operating (loss) income: |  |  |
Operating (loss) profit | (82,273) |  |
Corporate |  |  |
Operating (loss) income: |  |  |
Operating (loss) profit | (12,745) | (14,629) | (17,561)
Capital expenditures | 2,349 | 1,984 | 1,429
Depreciation and amortization | 305 | 438 | 460
Identifiable assets | 132,603 | 195,862 | 174,853
Impairment and Other Charges | 2,010 |  |
Gain (loss) on disposition of assets, net |  |  |
Operating (loss) income: |  |  |
Operating (loss) profit | $ 3,707 | $ 3,344 | $ 4,530

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