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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 750,853 | $ 661,659 | $ 752,627
Fleet |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 233,532 | 242,170 | 214,520
Aviation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 247,852 | 165,070 | 224,546
Federal and Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 269,469 | 254,419 | 313,561
Repair |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 75,725 | 82,445 | 119,044
Repair | Fleet |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Repair | Aviation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 75,725 | 82,445 | 119,044
Repair | Federal and Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 405,659 | 324,795 | 320,022
Distribution | Fleet |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 233,532 | 242,170 | 214,520
Distribution | Aviation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 172,127 | 82,625 | 105,502
Distribution | Federal and Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Cost Plus Contract |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 93,694 | 79,064 | 144,600
Cost Plus Contract | Fleet |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Cost Plus Contract | Aviation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Cost Plus Contract | Federal and Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 93,694 | 79,064 | 144,600
Fixed Price Contract |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 105,495 | 138,406 | 78,163
Fixed Price Contract | Fleet |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Fixed Price Contract | Aviation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Fixed Price Contract | Federal and Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 105,495 | 138,406 | 78,163
T&M Contract |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 70,280 | 36,949 | 90,798
T&M Contract | Fleet |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
T&M Contract | Aviation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
T&M Contract | Federal and Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 70,280 | 36,949 | 90,798
Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 322,318 | 208,305 | 242,518
Commercial | Fleet |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 73,606 | 42,733 | 22,161
Commercial | Aviation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 245,380 | 163,695 | 218,886
Commercial | Federal and Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,332 | 1,877 | 1,471
DoD |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 233,422 | 236,397 | 304,334
DoD | Fleet |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 12,689 | 20,744 | 24,246
DoD | Aviation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 1,093 | 3,775
DoD | Federal and Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 220,733 | 214,560 | 276,313
Other government |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 195,113 | 216,957 | 205,775
Other government | Fleet |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 147,237 | 178,693 | 168,113
Other government | Aviation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,472 | 282 | 1,885
Other government | Federal and Defense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 45,404 | $ 37,982 | $ 35,777

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