Intangible Assets

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

8. Intangible Assets

Goodwill, customer relationships and trademarks consist of the following amounts (in thousands):

	March 31, 2021		December 31, 2020
Goodwill	$	120,343	$	120,343
Customer relationships—Acquired
Cost	$	58,688	$	58,688
Accumulated amortization	(46,445)		(44,175)
Customer relationships—Acquired	$	12,243	$	14,513
Customer relationships—Other
Cost	$	8,898	$	8,988
Accumulated amortization	(6,415)		(5,733)
Customer relationships—Other, net	$	2,483	$	3,255
Trademarks
Cost	$	7,570	$	7,570
Accumulated amortization	(3,249)		(2,972)
Trademarks, net	$	4,321	$	4,598

Changes in goodwill, customer relationships (including non-compete agreements) and trademarks consisted of the following (in thousands):

	Goodwill		Customer Relationships— Acquired		Customer Relationships— Other		Trademarks
Balance at December 31, 2020	$	120,343	$	14,513	$	3,255	$	4,598
Adjustments	—		—		(28)		—
Amortization	—		(2,270)		(744)		(277)
Balance at March 31, 2021	$	120,343	$	12,243	$	2,483	$	4,321

Estimated future amortization expense for customer relationships and trademarks at March 31, 2021 is as follows (in thousands):

Year ending December 31,
2021 (remaining nine months)	$	9,823
2022	6,194
2023	605
2024	404
2025	404
> 5 years	1,617
Total	$	19,047