Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Components of Intangible Assets

Intangible assets, net consisted of the following:

		September 30, 2019							December 31, 2018
	Useful life			Accumulated							Accumulated
	(years)	Cost		amortization			Net		Cost		amortization			Net
Customer lists	5 - 15	$	113,357	$	(47,835	)	$	65,522	$	113,357	$	(39,966	)	$	73,391
Patents and    technology	3 - 10		23,424		(12,417	)		11,007		23,424		(10,551	)		12,873
Trade names and    trademarks	1 - 2		3,003		(3,003	)		—		3,003		(3,003	)		—
		$	139,784	$	(63,255	)	$	76,529	$	139,784	$	(53,520	)	$	86,264

Estimated Future Amortization Expense for Intangible Assets

Estimated future amortization expense for intangible assets is as follows:

	Amount
2019 (remaining)	$	3,250
2020		12,721
2021		12,112
2022		11,686
2023		11,408
2024		11,122
Thereafter		14,230
	$	76,529