Equity-Based Compensation (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Equity-based compensation expense
Total equity-based compensation expense	$ 2,668	$ 1,930
Income tax effect	(1,035)
After-tax effect of equity-based compendation expense	1,633	1,930
Cost of Sales
Equity-based compensation expense
Total equity-based compensation expense	41	28
Research and Development Expense
Equity-based compensation expense
Total equity-based compensation expense	478	449
Selling, General and Administrative Expenses [Member]
Equity-based compensation expense
Total equity-based compensation expense	$ 2,149	$ 1,453