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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