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Business Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 577,397 | $ 273,920 | $ 1,051,399 | $ 526,122
Gain (loss) on derivatives | (1,067) | 1,658 | 555 | 1,295
Interest expense, net of interest income | 4,686 | 3,276 | 8,639 | 6,016
Depreciation and amortization of intangible assets | 12,851 | 10,865 | 25,508 | 21,015
Income before taxes, excluding unallocated corporate activity | 55,478 | 26,082 | 92,992 | 51,683
U.S. Regions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 397,385 | 118,023 | 711,905 | 207,267
U.S. Federal |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 101,428 | 90,198 | 177,074 | 192,412
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 14,461 | 10,875 | 31,633 | 22,518
Alternative Fuels |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 29,192 | 26,213 | 58,453 | 51,793
All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 34,931 | 28,611 | 72,334 | 52,132
Operating Segments | U.S. Regions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 397,385 | 118,023 | 711,905 | 207,267
Gain (loss) on derivatives | (261) | (161) | (34) | 371
Interest expense, net of interest income | 1,883 | 1,453 | 3,525 | 2,896
Depreciation and amortization of intangible assets | 5,298 | 3,942 | 10,576 | 7,428
Income before taxes, excluding unallocated corporate activity | 32,840 | 7,718 | 51,058 | 10,957
Operating Segments | U.S. Federal |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 101,428 | 90,198 | 177,074 | 192,412
Gain (loss) on derivatives | 0 | 0 | 0 | 0
Interest expense, net of interest income | 315 | 326 | 621 | 647
Depreciation and amortization of intangible assets | 1,213 | 1,139 | 2,458 | 2,149
Income before taxes, excluding unallocated corporate activity | 12,011 | 11,082 | 20,897 | 23,112
Operating Segments | Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 14,461 | 10,875 | 31,633 | 22,518
Gain (loss) on derivatives | 45 | 26 | 96 | 205
Interest expense, net of interest income | 313 | 213 | 535 | 420
Depreciation and amortization of intangible assets | 430 | 485 | 877 | 900
Income before taxes, excluding unallocated corporate activity | 1,012 | 749 | 1,291 | 664
Operating Segments | Alternative Fuels |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 29,192 | 26,213 | 58,453 | 51,793
Gain (loss) on derivatives | (851) | 1,793 | 493 | 719
Interest expense, net of interest income | 2,193 | 1,207 | 3,983 | 1,817
Depreciation and amortization of intangible assets | 5,651 | 4,936 | 11,067 | 9,798
Income before taxes, excluding unallocated corporate activity | 6,476 | 4,716 | 13,898 | 13,488
Operating Segments | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 34,931 | 28,611 | 72,334 | 52,132
Gain (loss) on derivatives | 0 | 0 | 0 | 0
Interest expense, net of interest income | (18) | 77 | (25) | 236
Depreciation and amortization of intangible assets | 259 | 363 | 530 | 740
Income before taxes, excluding unallocated corporate activity | 3,139 | 1,817 | 5,848 | 3,462
Unallocated corporate activity |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Unallocated corporate activity | $ (17,673) | $ (10,092) | $ (33,582) | $ (21,057)

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