Intangible Assets

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

9. Intangible Assets

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

	March 31, 2019			December 31, 2018
Goodwill	$	120,343		$	120,343
Customer relationships—Acquired
Cost	$	99,402		$	99,402
Accumulated amortization	(67,679		)	(63,208		)
Customer relationships—Acquired & Non-Compete Agreements, net	$	31,723		$	36,194
Customer relationships—Other
Cost	$	23,029		$	16,155
Accumulated amortization	(10,868		)	(9,290		)
Customer relationships—Other, net	$	12,161		$	6,865
Trademarks
Cost	$	9,770		$	9,770
Accumulated amortization	(2,923		)	(2,483		)
Trademarks, net	$	6,847		$	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	—		—			6,874			—
Amortization	—		(4,471		)	(1,578		)	(440		)
Balance at March 31, 2019	$	120,343	$	31,723		$	12,161		$	6,847

Estimated future amortization expense for customer relationships and trademarks at March 31, 2019 is as follows (in thousands):

Year ending December 31,
2019	$	13,678
2020	14,548
2021	12,974
2022	6,034
2023	450
> 5 years	3,047
Total	$	50,731