Equity-Based Compensation - Equity-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity-based compensation expense
Total equity-based compensation expense	$ 5,891	$ 5,178	$ 11,669	$ 11,341
Income tax effect	(1,717)	(1,394)	(3,321)	(3,068)
After-tax effect of equity-based compensation expense	4,174	3,784	8,348	8,273
Cost of product sales and services
Equity-based compensation expense
Total equity-based compensation expense	129	(44)	258	277
Research and development
Equity-based compensation expense
Total equity-based compensation expense	1,095	968	1,851	1,725
Selling, general and administrative
Equity-based compensation expense
Total equity-based compensation expense	$ 4,667	$ 4,254	$ 9,560	$ 9,339