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Business Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 1,824,422 | $ 1,215,697 | $ 1,032,275
(Gain) loss on derivatives | (212) | 240 | (705)
Net interest expense | 17,775 | 14,599 | 13,436
Depreciation and intangible asset amortization | 52,432 | 44,757 | 40,137
Income before taxes, excluding unallocated corporate activity | 176,899 | 125,505 | 95,736
US Regions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,123,343 | 551,118 | 423,654
U.S. Federal |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 391,891 | 392,948 | 377,882
Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 58,558 | 49,483 | 47,757
Alternative Fuels |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 114,459 | 111,223 | 83,628
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 136,171 | 110,925 | 99,354
Operating Segments | US Regions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,123,343 | 551,118 | 423,654
(Gain) loss on derivatives | (354) | (1,017) | (744)
Net interest expense | 6,948 | 6,255 | 6,392
Depreciation and intangible asset amortization | 21,463 | 15,699 | 12,230
Income before taxes, excluding unallocated corporate activity | 88,531 | 38,285 | 26,227
Operating Segments | U.S. Federal |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 391,891 | 392,948 | 377,882
(Gain) loss on derivatives | 0 | 0 | 0
Net interest expense | 1,231 | 1,294 | 1,694
Depreciation and intangible asset amortization | 4,905 | 4,666 | 3,945
Income before taxes, excluding unallocated corporate activity | 50,866 | 52,388 | 44,571
Operating Segments | Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 58,558 | 49,483 | 47,757
(Gain) loss on derivatives | (152) | (73) | 153
Net interest expense | 917 | 879 | 699
Depreciation and intangible asset amortization | 1,702 | 1,872 | 1,584
Income before taxes, excluding unallocated corporate activity | 2,554 | 1,581 | 1,758
Operating Segments | Alternative Fuels |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 114,459 | 111,223 | 83,628
(Gain) loss on derivatives | 294 | 1,330 | (114)
Net interest expense | 8,657 | 5,793 | 4,467
Depreciation and intangible asset amortization | 23,354 | 21,080 | 20,722
Income before taxes, excluding unallocated corporate activity | 22,989 | 27,774 | 14,509
Operating Segments | All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 136,171 | 110,925 | 99,354
(Gain) loss on derivatives | 0 | 0 | 0
Net interest expense | 22 | 378 | 184
Depreciation and intangible asset amortization | 1,008 | 1,440 | 1,656
Income before taxes, excluding unallocated corporate activity | 11,959 | 5,477 | 8,671
Consolidation, Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Unallocated corporate activity | $ (71,180) | $ (47,361) | $ (39,308)

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