Goodwill and Intangibles (Tables)

12 Months Ended

Dec. 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, 2017	$	177,090	$	(70,004	)	$	107,086
Business combinations		47,727		—			47,727
Other		653		—			653

December 31, 2017		225,470		(70,004	)		155,466
Business combinations		17,023		—			17,023
Other		560		—			560

December 31, 2018	$	243,053	$	(70,004	)	$	173,049

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 December 31,
	2018						2017
	Gross				Net		Gross				Net
	Carrying		Accumulated		Book		Carrying		Accumulated		Book
	Amount		Amortization		Value		Amount		Amortization		Value
Amortized intangibles:
Customer relationships	$	148,635	$	52,514	$	96,121	$	121,015	$	38,651	$	82,364
Covenants not-to-compete		14,682		7,572		7,110		11,807		4,773		7,034
Trademarks and tradenames		64,432		18,256		46,176		58,136		14,076		44,060
Backlog		14,060		13,677		383		13,600		9,067		4,533

	$	241,809	$	92,019	$	149,790	$	204,558	$	66,567	$	137,991

Schedule of Estimated Aggregate Annual Amortization

Remaining estimated aggregate annual amortization expense is as follows (in thousands):


2019	$	23,250
2020		22,318
2021		21,012
2022		20,094
2023		17,183
Thereafter		45,933