Goodwill and Intangibles (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Change in Carrying Amount of Goodwill

The change in carrying amount of goodwill was as follows (in thousands):

	Goodwill (Gross)		Accumulated Impairment Losses			Goodwill (Net)
January 1, 2018	$	225,470	$	(70,004	)	$	155,466
Business Combinations		7,086		—			7,086
Other		471		—			471
June 30, 2018	$	233,027	$	(70,004	)	$	163,023

Schedule of Gross Carrying Amount, Accumulated Amortization and Net Book Value

The following table provides the gross carrying amount, accumulated amortization and net book value for each major class of intangibles (in thousands):

	As of June 30, 2018						As of December 31, 2017
	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Amortized intangibles:
Customer relationships	$	127,900	$	45,211	$	82,689	$	121,015	$	38,651	$	82,364
Covenants not-to-compete		12,715		6,120		6,595		11,807		4,773		7,034
Trademarks and trade names		61,068		16,119		44,949		58,136		14,076		44,060
Backlog		13,600		13,600		—		13,600		9,067		4,533
	$	215,283	$	81,050	$	134,233	$	204,558	$	66,567	$	137,991

Schedule of Estimated Aggregate Annual Amortization

Remaining estimated aggregate annual amortization expense is as follows (amounts, in thousands, are for the fiscal year ended):

Remainder of 2018	10,084
2019	19,685
2020	18,893
2021	17,850
2022	16,932
Thereafter	50,789