Employee Benefits and Share-Based Compensation - Shared-Based Compensation Expense (Details) (2009 Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 12,785,000	$ 11,151,000	$ 9,214,000
Income tax benefit	4,500,000	2,400,000	2,600,000
Cost of product and service revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	1,456,000	1,241,000	1,011,000
Research and development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	1,655,000	1,359,000	889,000
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 9,674,000	$ 8,551,000	$ 7,314,000