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v3.20.4

Business Segment and Entity wide Disclosures - Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues: |  |  |
Revenues | $ 598,302 | $ 1,222,409 | $ 1,721,005
Operating (loss) gain: |  |  |
Operating (loss) profit | (309,635) | (114,288) | 210,030
Capital expenditures | 65,065 | 250,629 | 242,610
Depreciation and amortization | 95,530 | 170,409 | 163,120
Identifiable assets | 790,505 | 1,053,218 | 1,199,580
Impairment and other charges | 217,493 | 82,273 |
Pension settlement loss (3) | (4,660) |  |
Technical Services |  |  |
Revenues: |  |  |
Revenues | 556,488 | 1,145,554 | 1,647,213
Operating (loss) gain: |  |  |
Operating (loss) profit | (82,525) | (32,993) | 216,703
Capital expenditures | 54,327 | 237,950 | 230,262
Depreciation and amortization | 80,877 | 154,776 | 150,508
Identifiable assets | 499,764 | 848,264 | 925,305
Impairment and other charges | 212,292 | 80,263 |
Support Services |  |  |
Revenues: |  |  |
Revenues | 41,814 | 76,855 | 73,792
Operating (loss) gain: |  |  |
Operating (loss) profit | (6,714) | 10,016 | 4,612
Capital expenditures | 10,224 | 10,330 | 10,364
Depreciation and amortization | 14,377 | 15,328 | 12,174
Identifiable assets | 64,457 | 72,351 | 78,413
Impairment and other charges |  |  |
Operating (loss) gain: |  |  |
Operating (loss) profit | (217,493) | (82,273) |
Corporate |  |  |
Operating (loss) gain: |  |  |
Operating (loss) profit | (12,426) | (12,745) | (14,629)
Capital expenditures | 514 | 2,349 | 1,984
Depreciation and amortization | 276 | 305 | 438
Identifiable assets | 226,284 | 132,603 | 195,862
Impairment and other charges |  | 2,010 |
Gain (loss) on disposition of assets, net |  |  |
Operating (loss) gain: |  |  |
Operating (loss) profit | $ 9,523 | $ 3,707 | $ 3,344

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