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Business Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 335,149 | $ 441,296 | $ 933,265 | $ 1,492,695
(Gain) loss on derivatives | (3,047) | (780) | (3,308) | (225)
Interest expense, net of interest income | 7,564 | 4,737 | 18,168 | 13,376
Depreciation and amortization of intangible assets | 16,613 | 13,529 | 46,053 | 39,037
Income before taxes, excluding unallocated corporate activity | 31,168 | 50,363 | 76,614 | 143,355
U.S. Regions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 143,239 | 271,206 | 406,593 | 983,111
U.S. Federal |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 87,341 | 99,124 | 226,916 | 276,198
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 17,534 | 12,366 | 51,140 | 43,999
Alternative Fuels |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 27,319 | 29,421 | 85,974 | 87,874
All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 59,716 | 29,179 | 162,642 | 101,513
Operating Segments | U.S. Regions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 143,239 | 271,206 | 406,593 | 983,111
(Gain) loss on derivatives | (1,658) | (329) | (2,086) | (363)
Interest expense, net of interest income | 1,583 | 1,694 | 4,701 | 5,219
Depreciation and amortization of intangible assets | 7,031 | 5,300 | 19,784 | 15,876
Income before taxes, excluding unallocated corporate activity | 15,161 | 26,349 | 33,401 | 77,407
Operating Segments | U.S. Federal |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 87,341 | 99,124 | 226,916 | 276,198
(Gain) loss on derivatives | (792) | 0 | (788) | 0
Interest expense, net of interest income | 278 | 306 | 864 | 927
Depreciation and amortization of intangible assets | 1,229 | 1,219 | 3,688 | 3,677
Income before taxes, excluding unallocated corporate activity | 12,128 | 15,726 | 26,227 | 36,623
Operating Segments | Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 17,534 | 12,366 | 51,140 | 43,999
(Gain) loss on derivatives | (107) | (121) | (60) | (25)
Interest expense, net of interest income | 175 | 196 | 539 | 731
Depreciation and amortization of intangible assets | 408 | 420 | 1,222 | 1,297
Income before taxes, excluding unallocated corporate activity | 1,106 | 191 | 3,027 | 1,482
Operating Segments | Alternative Fuels |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 27,319 | 29,421 | 85,974 | 87,874
(Gain) loss on derivatives | (490) | (330) | (374) | 163
Interest expense, net of interest income | 4,762 | 2,589 | 10,549 | 6,572
Depreciation and amortization of intangible assets | 6,668 | 6,391 | 18,741 | 17,458
Income before taxes, excluding unallocated corporate activity | 820 | 4,993 | 7,445 | 18,891
Operating Segments | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 59,716 | 29,179 | 162,642 | 101,513
(Gain) loss on derivatives | 0 | 0 | 0 | 0
Interest expense, net of interest income | 766 | (48) | 1,515 | (73)
Depreciation and amortization of intangible assets | 1,277 | 199 | 2,618 | 729
Income before taxes, excluding unallocated corporate activity | 1,953 | 3,104 | 6,514 | 8,952
Unallocated corporate activity |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Unallocated corporate activity | $ (20,380) | $ (18,971) | $ (56,354) | $ (52,553)

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