Business Segment and Entity Wide Disclosures - Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Revenues	$ 1,617,474	$ 1,601,762	$ 864,929
Operating income:
Operating income (loss)	244,950	287,940	16,291
Capital expenditures	181,005	139,552	67,645
Depreciation and amortization	108,123	83,017	72,686
Identifiable assets	1,286,845	1,129,013	864,365
Pension Settlement, Impairment and other charges
Operating income:
Operating income (loss)	(18,286)	(2,921)
Technical Services
Revenues:
Revenues	1,516,137	1,516,363	815,046
Support Services
Revenues:
Revenues	101,337	85,399	49,883
Corporate
Operating income:
Operating income (loss)	(18,473)	(17,660)	(13,300)
Capital expenditures	4,572	905	1,317
Depreciation and amortization	57	161	267
Identifiable assets	337,541	225,475	214,614
Segment reconciling item
Operating income:
Operating income (loss)	9,344	8,804	10,882
Operating Segments
Revenues:
Revenues	1,617,474	1,601,762	864,929
Operating Segments | Technical Services
Revenues:
Revenues	1,516,137	1,516,363	815,046
Operating income:
Operating income (loss)	245,904	281,622	24,434
Capital expenditures	160,799	126,327	59,316
Depreciation and amortization	97,773	73,016	62,667
Identifiable assets	867,550	823,434	580,406
Operating Segments | Support Services
Revenues:
Revenues	101,337	85,399	49,883
Operating income:
Operating income (loss)	26,461	18,095	(5,725)
Capital expenditures	15,634	12,320	7,012
Depreciation and amortization	10,293	9,840	9,752
Identifiable assets	$ 81,754	$ 80,104	$ 69,345