Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible AssetsThere were no changes in goodwill for the six months ended June 30, 2021. The goodwill balance consisted of the following (in thousands):


	Fleet		Federal and Defense		Aviation		Total
Balance as of December 31, 2020	$	63,190	$	30,883	$	144,053	$	238,126



Balance as of June 30, 2021	$	63,190	$	30,883	$	144,053	$	238,126

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
June 30, 2021
Contract and customer-related	$	220,495	$	(118,668)	$	(3,814)	$	98,013
Acquired technologies	12,400		(11,351)		—		1,049
Trade names	18,770		(15,827)		—		2,943
Total	$	251,665	$	(145,846)	$	(3,814)	$	102,005

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 six months ended June 30, 2021 is related to customer relationship intangible recognized in connection with the acquisition of HSS during the first quarter of 2021. See Note (2) "Acquisition and Divestitures" for additional details regarding the acquisition.

Amortization expense related to intangible assets was approximately $4.6 million and $4.5 million for the three months ended June 30, 2021 and 2020, respectively, and $8.9 million and $9.2 million for the six months ended June 30, 2021 and 2020, respectively.