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Business Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 1,374,633 | $ 1,824,422 | $ 1,215,697
Earnings (loss) from unconsolidated entities | 1,758 | 1,647 | (118)
(Gain) loss on derivatives | (1,108) | (212) | 240
Net interest expense (income) | 26,922 | 17,775 | 14,599
Depreciation and intangible asset amortization | 64,129 | 52,432 | 44,757
Income before taxes, excluding unallocated corporate activity | 106,641 | 176,899 | 125,505
U.S. Regions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 557,122 | 1,123,343 | 551,118
U.S. Federal |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 402,884 | 391,891 | 392,948
Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 70,110 | 58,558 | 49,483
Alternative Fuels |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 117,075 | 114,459 | 111,223
Europe |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 152,842 | 61,645 | 46,164
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 74,600 | 74,526 | 64,761
Operating Segments | U.S. Regions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 557,122 | 1,123,343 | 551,118
Earnings (loss) from unconsolidated entities | 0 | 0 | (56)
(Gain) loss on derivatives | (2,326) | (354) | (1,017)
Net interest expense (income) | 6,169 | 6,948 | 6,255
Depreciation and intangible asset amortization | 27,060 | 21,463 | 15,699
Income before taxes, excluding unallocated corporate activity | 38,746 | 88,531 | 38,285
Operating Segments | U.S. Federal |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 402,884 | 391,891 | 392,948
Earnings (loss) from unconsolidated entities | 1,758 | 1,647 | 0
(Gain) loss on derivatives | 857 | 0 | 0
Net interest expense (income) | 1,429 | 1,231 | 1,294
Depreciation and intangible asset amortization | 5,343 | 4,905 | 4,666
Income before taxes, excluding unallocated corporate activity | 49,237 | 50,866 | 52,388
Operating Segments | Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 70,110 | 58,558 | 49,483
Earnings (loss) from unconsolidated entities | 0 | 0 | 0
(Gain) loss on derivatives | (136) | (152) | (73)
Net interest expense (income) | 834 | 917 | 879
Depreciation and intangible asset amortization | 1,626 | 1,702 | 1,872
Income before taxes, excluding unallocated corporate activity | 3,813 | 2,554 | 1,581
Operating Segments | Alternative Fuels |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 117,075 | 114,459 | 111,223
Earnings (loss) from unconsolidated entities | 0 | 0 | 0
(Gain) loss on derivatives | 497 | 294 | 1,330
Net interest expense (income) | 16,019 | 8,657 | 5,793
Depreciation and intangible asset amortization | 26,160 | 23,354 | 21,080
Income before taxes, excluding unallocated corporate activity | 6,215 | 22,989 | 27,774
Operating Segments | Europe |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 152,842 | 61,645 | 46,164
Earnings (loss) from unconsolidated entities | 0 | 0 | (62)
(Gain) loss on derivatives | 0 | 0 | 0
Net interest expense (income) | 2,477 | 25 | 378
Depreciation and intangible asset amortization | 2,290 | 575 | 716
Income before taxes, excluding unallocated corporate activity | 4,188 | 5,589 | 2,997
Operating Segments | All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 74,600 | 74,526 | 64,761
Earnings (loss) from unconsolidated entities | 0 | 0 | 0
(Gain) loss on derivatives | 0 | 0 | 0
Net interest expense (income) | (6) | (3) | 0
Depreciation and intangible asset amortization | 1,650 | 433 | 724
Income before taxes, excluding unallocated corporate activity | 4,442 | 6,370 | 2,480
Consolidation, Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Unallocated corporate activity | $ (68,372) | $ (71,180) | $ (47,361)

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