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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill by Operating Segment
Changes in the carrying amount of goodwill by segment for the three months ended March 31, 2023 were as follows (in thousands):
 AviationFleetFederal and DefenseTotal
Balance as of December 31, 2022$154,072 $63,190 $31,575 $248,837 
Acquisitions4,743 — — 4,743 
Balance as of March 31, 2023$158,815 $63,190 $31,575 $253,580 
Schedule of Intangible Assets
Intangible assets consisted of the following (in thousands):
 Gross carrying valueAccumulated amortizationNet carrying value
March 31, 2023
Contract and customer-related$210,091 $(120,953)$89,138 
Trade names8,670 (7,744)926 
Total$218,761 $(128,697)$90,064 
December 31, 2022   
Contract and customer-related$206,291 $(116,881)$89,410 
Trade names8,670 (7,456)1,214 
Total$214,961 $(124,337)$90,624 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
As of March 31, 2023, the estimated future annual amortization expense related to intangible assets is as follows (in thousands):
Year Ending
Remainder of 2023$9,976 
202410,819 
20259,775 
20268,950 
20277,204 
Thereafter43,340 
Total$90,064