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BUSINESS SEGMENT INFORMATION - Segment Summary (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Revenues: |  |  |  |  |
Revenues | $ 293,240 | $ 439,994 | $ 986,412 | $ 1,344,254 |
Operating (loss) income: |  |  |  |  |
Impairment and other charges | 71,650 |  | 71,650 |  |
(Loss) Gain on disposition of assets, net | (1,727) | 286 | 2,910 | 3,459 |
Operating (loss) income | (92,639) | 54,553 | (86,413) | 190,380 |
Interest expense | (8) | (150) | (261) | (368) |
Interest income | 182 | 783 | 1,576 | 1,643 |
Other (expense) income , net | (937) | 287 | (545) | 9,786 |
(Loss) income before income taxes | (93,402) | 55,473 | (85,643) | 201,441 |
Depreciation and amortization | 44,701 | 42,993 | 130,087 | 120,567 |
Capital expenditures |  |  | 209,263 | 199,581 |
Identifiable assets | 1,109,863 | 1,245,662 | 1,109,863 | 1,245,662 | $ 1,199,580
Technical Services |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 274,483 | 421,271 | 926,596 | 1,290,186 |
Operating (loss) income: |  |  |  |  |
Impairment and other charges | 69,640 |  |  |  |
Operating (loss) income | (18,174) | 56,209 | (15,782) | 196,838 |
Depreciation and amortization |  |  | 122,827 | 110,991 |
Capital expenditures |  |  | 198,757 | 194,115 |
Identifiable assets | 963,544 | 984,397 | 963,544 | 984,397 |
Support Services |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 18,757 | 18,723 | 59,816 | 54,068 |
Operating (loss) income: |  |  |  |  |
Operating (loss) income | 1,632 | 1,787 | 8,787 | 2,075 |
Depreciation and amortization |  |  | 7,026 | 9,247 |
Capital expenditures |  |  | 8,546 | 4,260 |
Identifiable assets | 77,848 | 77,870 | 77,848 | 77,870 |
Corporate |  |  |  |  |
Operating (loss) income: |  |  |  |  |
Impairment and other charges |  |  | 2,010 |  |
Operating (loss) income | (2,720) | (3,729) | (10,678) | (11,992) |
Depreciation and amortization |  |  | 234 | 329 |
Capital expenditures |  |  | 1,960 | 1,206 |
Identifiable assets | $ 68,471 | $ 183,395 | $ 68,471 | $ 183,395 |

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