Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Components of Goodwill

Goodwill consisted of the following:

	2018			2017
Balance at January 1,	$	166,678		$	114,033
Additions through acquisitions		—			52,645
Measurement period adjustments		(549	)		—
Balance at December 31,	$	166,129		$	166,678

Components of Intangible Assets

Intangible assets, net consisted of the following:

		December 31, 2018							December 31, 2017
	Useful life (years)	Cost		Accumulated amortization			Net		Cost		Accumulated amortization			Net
Customer lists	5 - 15	$	113,357	$	(39,966	)	$	73,391	$	113,357	$	(29,451	)	$	83,906
Patents and technology	3 - 10		23,424		(10,551	)		12,873		23,424		(8,080	)		15,344
Trade names and trademarks	1 - 2		3,003		(3,003	)		—		3,003		(2,914	)		89
		$	139,784	$	(53,520	)	$	86,264	$	139,784	$	(40,445	)	$	99,339

Estimated Future Amortization Expense for Intangible Assets

Estimated future amortization expense for intangible assets is as follows:

Years ending December 31,
2019		12,328
2020		12,145
2021		11,486
2022		11,060
2023		10,782
2024		10,496
Thereafter		17,967
	$	86,264