Basis of Presentation and Significant Accounting Policies (Revenue Recognition) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deferred Revenue and Credits [Abstract]
Inventory valued at published list prices and held by sell-through distributors with right of return	$ 99,919	$ 86,218
Allowance for distributor advances	(47,720)	(37,090)
Deferred cost of sales related to inventory held by sell-through distributors	(16,080)	(16,871)
Total Deferred income and allowances on sales to sell-through distributors	$ 36,119	$ 32,257