Business Segment and Entity Wide Disclosures - Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Revenues	$ 864,929	$ 598,302	$ 1,222,409
Operating profit (loss):
Operating profit (loss)	16,291	(309,635)	(114,288)
Capital expenditures	67,645	65,065	250,629
Depreciation and amortization	72,686	95,530	170,409
Identifiable assets	864,365	790,505	1,053,218
Impairment and Other Charges (1)		217,493	82,273
Pension settlement loss		4,660
Technical Services
Revenues:
Revenues	815,046	556,488	1,145,554
Operating profit (loss):
Operating profit (loss)	24,434	(82,525)	(32,993)
Capital expenditures	59,316	54,327	237,950
Depreciation and amortization	62,667	80,877	154,776
Identifiable assets	580,406	499,764	848,264
Impairment and Other Charges (1)		212,292	80,263
Support Services
Revenues:
Revenues	49,883	41,814	76,855
Operating profit (loss):
Operating profit (loss)	(5,725)	(6,714)	10,016
Capital expenditures	7,012	10,224	10,330
Depreciation and amortization	9,752	14,377	15,328
Identifiable assets	69,345	64,457	72,351
Impairment and other charges
Operating profit (loss):
Operating profit (loss)		(217,493)	(82,273)
Corporate
Operating profit (loss):
Operating profit (loss)	(13,300)	(12,426)	(12,745)
Capital expenditures	1,317	514	2,349
Depreciation and amortization	267	276	305
Identifiable assets	214,614	226,284	132,603
Impairment and Other Charges (1)			2,010
Gain on disposition of assets, net.
Operating profit (loss):
Operating profit (loss)	$ 10,882	$ 9,523	$ 3,707