Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill, Customer Relationships and Trademarks

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

	December 31, 2020		December 31, 2019
Goodwill	$	120,343	$	120,343
Customer Relationships— Acquired
Cost	$	58,688	$	64,083
Accumulated amortization	(44,175)		(40,231)
Customer Relationships—Acquired	$	14,513	$	23,852
Customer Relationships—Other
Cost	$	8,988	$	17,056
Accumulated amortization	(5,733)		(9,534)
Customer Relationships—Other, net	$	3,255	$	7,522
Trademarks
Cost	$	7,570	$	8,502
Accumulated amortization	(2,972)		(2,794)
Trademarks, net	$	4,598	$	5,708

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

	Goodwill		Customer Relationships— Acquired & Non-Compete Agreements		Customer Relationships— Other		Trademarks
Balance at December 31, 2017	$	120,154	$	46,690	$	6,802	$	8,558
Additions	—		6,205		3,818		—
Adjustments (1)	189		(174)		—		—
Amortization	—		(16,527)		(3,755)		(1,271)
Balance at December 31, 2018	$	120,343	$	36,194	$	6,865	$	7,287
Additions	—		—		6,913		—
Amortization	—		(12,342)		(6,256)		(1,579)
Balance at December 31, 2019	$	120,343	$	23,852	$	7,522	$	5,708
Amortization	—		(9,339)		(4,267)		(1,110)
Balance at December 31, 2020	$	120,343	$	14,513	$	3,255	$	4,598

(1) Related to working capital adjustments on various acquisitions.

Estimated Future Amortization Expense

Estimated future amortization expense for customer relationships and trademarks at December 31, 2020 is as follows (in thousands):

Year Ending December 31,
2021	$	13,142
2022	6,194
2023	605
2024	404
2025	404
> 5 years	1,617
Total	$	22,366