Intangible Assets

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

9. Intangible Assets

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

	June 30, 2019			December 31, 2018
Goodwill	$	120,343		$	120,343
Customer relationships—Acquired
Cost	$	84,248		$	99,402
Accumulated amortization	(55,336		)	(63,208		)
Customer relationships—Acquired & Non-Compete Agreements, net	$	28,912		$	36,194
Customer relationships—Other
Cost	$	17,885		$	16,155
Accumulated amortization	(7,520		)	(9,290		)
Customer relationships—Other, net	$	10,365		$	6,865
Trademarks
Cost	$	9,770		$	9,770
Accumulated amortization	(3,373		)	(2,483		)
Trademarks, net	$	6,397		$	7,287

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, 2018	$	120,343	$	36,194		$	6,865		$	7,287
Additions	—		—			6,913			—
Amortization	—		(7,282		)	(3,413		)	(890		)
Balance at June 30, 2019	$	120,343	$	28,912		$	10,365		$	6,397

Estimated future amortization expense for customer relationships and trademarks at June 30, 2019 is as follows (in thousands):

Year ending December 31,
2019 (remaining six months)	$	8,592
2020	14,561
2021	12,987
2022	6,038
2023	450
> 5 years	3,046
Total	$	45,674