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Goodwill and Intangible Assets
3 Months Ended
Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill

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 

Goodwill increased during the three months ended March 31, 2023 in connection with the acquisition during the period as discussed in Note (2) "Acquisitions."

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 

The gross carrying amount of contract and customer-related intangibles increased during the three months ended March 31, 2023 in connection with the acquisition during the period as discussed in Note (2) "Acquisitions."

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