Goodwill and Intangibles (Tables)

12 Months Ended

Dec. 31, 2020

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, 2019	$	243,053	$	(70,004)	$	173,049
Business combinations	22,405		—		22,405
Other	198		—		198
December 31, 2019	265,656		(70,004)		195,652
Business combinations	21,305		—		21,305
Other	(87)		—		(87)
December 31, 2020	$	286,874	$	(70,004)	$	216,870

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,
	2020						2019
	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Amortized intangibles:
Customer relationships	$	197,641	$	89,137	$	108,504	$	169,334	$	69,388	$	99,946
Covenants not-to-compete	20,309		13,436		6,873		16,959		10,617		6,342
Trademarks and tradenames	79,657		27,245		52,412		69,718		22,609		47,109
Backlog	18,847		15,243		3,604		14,080		13,915		165
	$	316,454	$	145,061	$	171,393	$	270,091	$	116,529	$	153,562

Schedule of Estimated Aggregate Annual Amortization

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


2021			$32,357
2022			28,884
2023			25,447
2024			21,934
2025			16,529
Thereafter			46,242