Stock-Based Compensation, Stock Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 7,865	$ 5,882	$ 12,357	$ 13,493
Related income tax benefits	(3,146)	(2,353)	(4,943)	(5,397)
Stock-based compensation expense, net of taxes	4,719	3,529	7,414	8,096
Sales, Marketing and Administrative Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	7,415	5,446	11,846	12,723
Research and development expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	397	373	406	632
Cost of goods sold [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 53	$ 63	$ 105	$ 138