Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets

Schedule of changes in goodwill

	Gross carrying		Accumulated
	amount		impairment		Net amount
	(in thousands)
Balance at December 31, 2016	$	238,108	$	123,200	$	114,908
Acquisition		192,223		—		192,223
Balance at December 31, 2017		430,331		123,200		307,131
Impairment		—		122,829		(122,829)
Balance at December 31, 2018	$	430,331	$	246,029	$	184,302

Schedule of intangible assets excluding goodwill

		December 31, 2018						December 31, 2017
	Weighted
	Average			Accumulated						Accumulated
	Remaining	Gross		Amortization				Gross		Amortization
	Amortization	Carrying		and		Net		Carrying		and		Net
	Period	Amount		Impairment		Amount		Amount		Impairment		Amount
	(in years)	(in thousands)
Technology	6.4	$	337,218	$	290,808	$	46,410	$	307,588	$	133,121	$	174,467
Customer relationships	10.2		164,595		136,126		28,469		164,595		39,336		125,259
In-process R&D	—		13,710		10,530		3,180		43,340		—		43,340
Trademarks and tradenames	5.4		30,910		23,899		7,011		30,910		4,321		26,589
Other	1.3		3,686		3,607		79		3,686		3,498		188
Total	7.3	$	550,119	$	464,970	$	85,149	$	550,119	$	180,276	$	369,843

Schedule of estimated annual amortization expense, excluding in-process R&D for intangible assets with definite useful lives

	Amortization
	(in thousands)
2019	$	16,820
2020		15,894
2021		12,772
2022		10,438
2023		8,675
Thereafter		17,370
Total	$	81,969