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Business Segment and Entity Wide Disclosures - Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues:      
Revenues $ 1,414,999 $ 1,617,474 $ 1,601,762
Selling, general and administrative expenses 156,437 165,940 148,573
Segment depreciation and amortization 132,575 108,123 83,017
Operating income 97,538 244,950 287,940
Gain on sale of assets 8,199 9,344 8,804
Pension settlement charges   (18,286) (2,921)
Operating segments      
Revenues:      
Revenues 1,414,999 1,617,474 1,601,762
Employment Costs 323,785 329,582 302,760
Materials and Supplies 336,300 340,422 360,583
Maintenance & Repairs 202,536 198,734 203,816
Fleet and Transportation 64,245 106,837 131,104
Other cost of revenues 109,782 113,944 89,852
Cost of revenues (exclusive of depreciation and amortization) 1,036,648 1,089,519 1,088,115
Employment Costs 66,819 71,080 67,749
Enterprise Shared Services 36,843 31,404 28,934
Other selling, general and administrative expenses 37,254 45,040 34,391
Selling, general and administrative expenses 140,916 147,524 131,074
Segment depreciation and amortization 132,498 108,066 82,856
Operating income 104,937 272,365 299,717
Operating segments | Technical Services      
Revenues:      
Revenues 1,326,005 1,516,137 1,516,363
Employment Costs 303,327 307,396 284,439
Materials and Supplies 332,781 337,006 356,538
Maintenance & Repairs 190,996 186,703 194,178
Fleet and Transportation 61,148 102,723 127,206
Other cost of revenues 104,340 108,925 84,221
Cost of revenues (exclusive of depreciation and amortization) 992,592 1,042,753 1,046,582
Employment Costs 57,649 61,158 58,723
Enterprise Shared Services 35,357 29,179 26,767
Other selling, general and administrative expenses 31,080 39,370 29,653
Selling, general and administrative expenses 124,086 129,707 115,143
Segment depreciation and amortization 120,226 97,773 73,016
Operating income 89,101 245,904 281,622
Operating segments | Support Services      
Revenues:      
Revenues 88,994 101,337 85,399
Employment Costs 20,458 22,186 18,321
Materials and Supplies 3,519 3,416 4,045
Maintenance & Repairs 11,540 12,031 9,638
Fleet and Transportation 3,097 4,114 3,898
Other cost of revenues 5,442 5,019 5,631
Cost of revenues (exclusive of depreciation and amortization) 44,056 46,766 41,533
Employment Costs 9,170 9,922 9,026
Enterprise Shared Services 1,486 2,225 2,167
Other selling, general and administrative expenses 6,174 5,670 4,738
Selling, general and administrative expenses 16,830 17,817 15,931
Segment depreciation and amortization 12,272 10,293 9,840
Operating income 15,836 26,461 18,095
Unallocated      
Revenues:      
Selling, general and administrative expenses 15,521 18,416 17,499
Segment depreciation and amortization 77 57 161
Unallocated corporate expenses 15,598 18,473 17,660
Segment Reporting, Reconciling Item, Excluding Corporate Non segment      
Revenues:      
Gain on sale of assets $ (8,199) 18,286 2,921
Pension settlement charges   $ (9,344) $ (8,804)