Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets

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Goodwill and Intangible Assets
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible AssetsChanges in goodwill for the nine months ended September 30, 2021 are as follows (in thousands):
  Fleet Federal and Defense Aviation Total
Balance as of December 31, 2020 $ 63,190  $ 30,883  $ 144,053  $ 238,126 
Increase from acquisitions —  —  2,700  2,700 
Balance as of September 30, 2021 $ 63,190  $ 30,883  $ 146,753  $ 240,826 
We perform an annual review of goodwill for impairment during the fourth quarter and whenever events or other changes in circumstances indicate that the carrying value may not be fully recoverable. 

Intangible assets, net comprised the following (in thousands):
  Cost Accumulated Amortization Accumulated
Impairment Loss
Net Intangible Assets
September 30, 2021
Contract and customer-related $ 240,452  $ (123,019) $ (3,814) $ 113,619 
Acquired technologies 12,400  (11,633) —  767 
Trade names 18,770  (16,115) —  2,655 
Total $ 271,622  $ (150,767) $ (3,814) $ 117,041 
December 31, 2020        
Contract and customer-related $ 213,194  $ (110,917) $ (3,814) $ 98,463 
Acquired technologies 12,400  (10,787) —  1,613 
Trade names 18,770  (15,251) —  3,519 
Total $ 244,364  $ (136,955) $ (3,814) $ 103,595 

The increase in the gross carrying amount of contract and customer-related intangibles during the nine months ended September 30, 2021 is related to customer relationship intangibles recognized in connection with the acquisitions of HSS and Global Parts. See Note (2) "Acquisitions and Divestitures" for additional details regarding the acquisitions.

Amortization expense related to intangible assets was $4.9 million and $4.2 million for the three months ended September 30, 2021 and 2020, respectively, and $13.8 million and $13.3 million for the nine months ended September 30, 2021 and 2020, respectively.