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Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets

Schedule of changes in goodwill

				Gross carrying					Accumulated
				amount					impairment					Net amount
									(in thousands)
Balance at December 31, 2014				$	238,158				$	123,199				$	114,959
Purchase price adjustments				(51		)			—					(51		)

Balance at December 31, 2015 and 2016				$	238,107				$	123,199				$	114,908

Schedule of intangible assets

						December 31, 2016															December 31, 2015
		Weighted									Accumulated															Accumulated
		Average Remaining				Gross					Amortization										Gross					Amortization
		Amortization				Carrying					and					Net					Carrying					and					Net
		Period				Amount					Impairment					Amount					Amount					Impairment					Amount
		(in years)				(in thousands)
Technology		7.3				$	149,198				$	113,904				$	35,294				$	222,358				$	120,496				$	101,862
Customer relationships		11.9				47,885					28,659					19,226					47,885					22,470					25,415
Trademarks and tradenames		4.3				2,590					1,948					642					2,730					1,937					793
Indefinite-lived trademark		—				2,900					—					2,900					2,900					—					2,900
Other		2.9				2,026					1,710					316					6,241					5,537					704

Total		8.9				$	204,599				$	146,221				$	58,378				$	282,114				$	150,440				$	131,674

Schedule of estimated aggregate amortization expense for intangible assets with definite useful lives

				Amortization
				(in thousands)
2017				$	11,470
2018				9,893
2019				8,608
2020				7,530
2021				5,491
Thereafter				12,486

Total				$	55,478