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BUSINESS SEGMENT INFORMATION - Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Revenues: |  |  |  |
Revenues | $ 225,310 | $ 116,588 | $ 596,677 | $ 449,665
Operating income (loss): |  |  |  |
Operating income (loss) | 7,974 | (31,752) | (3,767) | (287,989)
Impairment and Other Charges (1) | 0 | 0 | 0 | (207,175)
Gain on disposition of assets, net | 2,837 | 3,563 | 7,408 | 7,576
Interest expense | 1,280 | 73 | 1,763 | 257
Interest income | 15 | 29 | 47 | 431
Other income (expense), net | 448 | 769 | 1,571 | (1,020)
Income (loss) before income taxes | 7,157 | (31,027) | (3,912) | (288,835)
Depreciation and amortization | 18,106 | 18,655 | 53,775 | 77,521
Capital expenditures |  |  | 44,925 | 52,313
Identifiable assets | 826,640 | 800,877 | 826,640 | 800,877
Technical Services |  |  |  |
Revenues: |  |  |  |
Revenues | 211,842 | 109,278 | 560,602 | 417,511
Operating income (loss): |  |  |  |
Operating income (loss) | 8,272 | (24,941) | 3,938 | (71,248)
Depreciation and amortization |  |  | 46,341 | 77,224
Capital expenditures |  |  | 38,794 | 43,437
Identifiable assets | 556,385 | 475,168 | 556,385 | 475,168
Support Services |  |  |  |
Revenues: |  |  |  |
Revenues | 13,468 | 7,310 | 36,075 | 32,154
Operating income (loss): |  |  |  |
Operating income (loss) | (55) | (3,840) | (5,353) | (4,139)
Depreciation and amortization |  |  | 7,232 | 5,088
Capital expenditures |  |  | 5,436 | 8,338
Identifiable assets | 74,135 | 64,463 | 74,135 | 64,463
Corporate |  |  |  |
Operating income (loss): |  |  |  |
Operating income (loss) | (3,080) | (6,534) | (9,760) | (13,003)
Impairment and Other Charges (1) | 541 |  |  |
Depreciation and amortization |  |  | 202 | 209
Capital expenditures |  |  | 695 | 538
Identifiable assets | $ 196,120 | $ 261,246 | $ 196,120 | $ 261,246

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