Acquisition (Additional Information) (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
	Jan. 22, 2015	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Weighted average amortization period (in years)					5 years 8 months
Annual amortization expense		$ 2,800		$ 1,500	$ 8,000	$ 4,700
Annual Future Amortization Expense
Anticipated future amortization expense for remainder of 2015		2,800			2,800
Anticipated future amortization expense for 2016		10,400			10,400
Anticipated future amortization expense for 2017		10,000			10,000
Anticipated future amortization expense for 2018		9,500			9,500
Anticipated future amortization expense for 2019		9,000			9,000
Operating income		23,055		$ 28,389	$ 63,665	$ 66,066
Customer relationships [Member]
Business Acquisition [Line Items]
Weighted average amortization period (in years)					6 years 3 months
Arlon [Member]
Business Acquisition [Line Items]
Consideration transferred	$ 157,000
Intangible assets	50,020
Annual Future Amortization Expense
Anticipated future amortization expense for remainder of 2015		1,600			$ 1,600
Anticipated future amortization expense for 2016		5,800			5,800
Anticipated future amortization expense for 2017		5,800			5,800
Anticipated future amortization expense for 2018		5,800			5,800
Anticipated future amortization expense for 2019		5,800			5,800
Transaction costs		1,500			1,500
Revenues		27,800			73,400
Operating income		$ 3,600			$ 7,700
Arlon [Member] | Minimum [Member]
Business Acquisition [Line Items]
Annual amortization expense	1,600
Arlon [Member] | Maximum [Member]
Business Acquisition [Line Items]
Annual amortization expense	5,800
Arlon [Member] | Developed technology [Member]
Business Acquisition [Line Items]
Intangible assets	$ 15,800
Weighted average amortization period (in years)	5 years 8 months
Arlon [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Intangible assets	$ 32,700
Weighted average amortization period (in years)	6 years
Arlon [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Intangible assets	$ 1,600
Weighted average amortization period (in years)	3 years 2 months
Arlon [Member] | Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Proceeds from line of credit	$ 125,000		$ 125,000