Goodwill and Intangibles (Tables)

3 Months Ended

Mar. 31, 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		5,783		—			5,783
Other		432		—			432
March 31, 2018	$	231,685	$	(70,004	)	$	161,681

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 March 31, 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	$	124,860	$	41,866	$	82,994	$	121,015	$	38,651	$	82,364
Covenants not-to-compete		12,112		5,423		6,689		11,807		4,773		7,034
Trademarks and trade names		60,024		15,089		44,935		58,136		14,076		44,060
Backlog		13,600		11,333		2,267		13,600		9,067		4,533
	$	210,596	$	73,711	$	136,885	$	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	$	16,966
2019		19,054
2020		18,338
2021		17,320
2022		16,402
Thereafter		48,805