Equity Compensation Plans (Share-Based Compensation Expense Related To Employee Share-Based Compensation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total	$ 28,078	$ 22,642	$ 17,977
Restricted Stock Awards & Time-Based Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total	18,727	18,612	13,922
Performance Share Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total	8,095	2,921	3,254
ESPP
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total	1,256	1,109	801
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total	2,243	1,425	917
Research and development expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total	4,206	3,530	2,374
Selling, general and administrative expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total	$ 21,629	$ 17,687	$ 14,686