Stock-Based Compensation, Stock Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 7,288	$ 7,077	$ 19,645	$ 20,570
Related income tax benefits	(2,915)	(2,831)	(7,858)	(8,228)
Stock-based compensation expense, net of taxes	4,373	4,246	11,787	12,342
Sales, Marketing and Administrative Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	6,826	6,725	18,672	19,448
Research and development expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	399	288	805	920
Cost of goods sold [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 63	$ 64	$ 168	$ 202