Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

7. Goodwill and Intangible Assets

Goodwill represents the excess of the purchase price of an acquired business over the estimated fair values of the underlying net tangible and intangible assets. Goodwill is allocated to the Company’s one reportable segment, which is its only reporting unit.

The Company’s intangible assets, net consisted of the following:

		March 31, 2019							December 31, 2018
	Useful life			Accumulated							Accumulated
	(years)	Cost		amortization			Net		Cost		amortization			Net
Customer lists	5 - 15	$	113,357	$	(42,589	)	$	70,768	$	113,357	$	(39,966	)	$	73,391
Patents and    technology	3 - 10		23,424		(11,163	)		12,261		23,424		(10,551	)		12,873
Trade names and    trademarks	1 - 2		3,003		(3,003	)		—		3,003		(3,003	)		—
		$	139,784	$	(56,755	)	$	83,029	$	139,784	$	(53,520	)	$	86,264

At March 31, 2019, the weighted-average amortization period for the intangible assets was 10.5 years. At March 31, 2019, the weighted-average amortization periods for customer lists, patents and technology and trade names and trademarks were 10.9, 9.3 and 1.2 years, respectively.

Amortization expense for the three months ended March 31, 2019 and 2018 was $3,235 and $3,281, respectively.

Estimated future amortization expense for intangible assets is as follows:

	Amount
2019 (remaining)	$	9,732
2020		12,066
2021		11,515
2022		11,060
2023		10,829
2024		10,449
Thereafter		17,378
	$	83,029