Assets (Tables)

9 Months Ended

Sep. 30, 2015

Assets

Schedule of assets (excluding cash balances) that are measured at fair value on a recurring basis

	Level 1		Level 2		Total
	(in thousands)
September 30, 2015
U.S. treasuries	$	54,731	$	—	$	54,731
Government agency securities	—		2,999		2,999
Corporate debt	—		11,147		11,147
December 31, 2014
U.S. treasuries	$	81,527	$	—	$	81,527
Corporate debt	—		39,045		39,045

Schedule of amortized cost and fair value of available-for-sale securities

			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
	Cost		Gains		Losses			Fair Value
	(in thousands)
September 30, 2015
U.S. treasuries	$	54,693	$	38	$	(0	)	$	54,731
Government agency securities	2,999		—		—			2,999
Corporate debt	11,142		6		(1		)	11,147
Total available-for-sale securities	$	68,834	$	44	$	(1	)	$	68,877
December 31, 2014
U.S. treasuries	$	81,506	$	27	$	(6	)	$	81,527
Corporate debt	39,031		20		(6		)	39,045
Total available-for-sale securities	$	120,537	$	47	$	(12	)	$	120,572

Summary of fair value and unrealized losses of available-for-sale securities in a loss position

	September 30, 2015					December 31, 2014
			Gross					Gross
	Estimated		Unrealized			Estimated		Unrealized
	Fair Value		Losses			Fair Value		Losses
	(in thousands)
U.S. treasuries	$	2,000	$	(0	)	$	35,001	$	(6	)
Corporate debt	1,139		(1		)	13,069		(6		)
Total available-for-sale securities in a loss position	$	3,139	$	(1	)	$	48,070	$	(12	)

Schedule of inventory

	September 30, 2015		December 31, 2014
	(in thousands)
Materials	$	38,043	$	28,637
Work-in-process	26,612		26,778
Finished goods	5,318		6,056
Total inventory	$	69,973	$	61,471

Schedule of property, plant and equipment

	September 30, 2015		December 31, 2014
	(in thousands)
Land	$	9,592	$	9,392
Building and improvements	54,562		51,979
Machinery and equipment	108,613		104,815
Leasehold improvements	5,417		4,356
Gross property, plant and equipment	178,184		170,542
Less: accumulated depreciation and amortization	97,663		91,790
Net property, plant, and equipment	$	80,521	$	78,752

Schedule of changes in goodwill

	Gross carrying			Accumulated
	amount			impairment		Net amount
	(in thousands)
Goodwill - December 31, 2014	$	238,158		$	123,199	$	114,959
Purchase price allocation adjustment	(51		)	—		(51		)
Goodwill - September 30, 2015	$	238,107		$	123,199	$	114,908

Schedule of intangible assets excluding goodwill

	September 30, 2015						December 31, 2014
			Accumulated						Accumulated
	Gross		Amortization				Gross		Amortization
	Carrying		and		Net		Carrying		and		Net
	Amount		Impairment		Amount		Amount		Impairment		Amount
	(in thousands)
Technology	$	222,358	$	116,958	$	105,400	$	222,358	$	106,342	$	116,016
Customer relationships	47,885		20,578		27,307		47,885		14,918		32,967
Trademarks and tradenames	2,730		1,719		1,011		3,050		1,096		1,954
Indefinite-lived trademark	2,900		—		2,900		2,900		—		2,900
Other	6,241		5,383		858		6,320		849		5,471
Total	$	282,114	$	144,638	$	137,476	$	282,513	$	123,205	$	159,308