Income Taxes (Tax Effects of Temporary Differences Result in Significant Portions of Deferred Tax Accounts) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Liabilities:
Depreciation and Amortization and Other	$ (19,157)	$ (20,368)
Total Gross Deferred Tax Liabilities	(19,157)	(20,368)
Deferred Tax Assets:
Stock-Based Compensation Expense	3,941	3,794
Reserves and Accruals	10,241	9,825
Employee Benefits	1,144	1,034
Inventory Reserves	3,336	10,699
Inventory Capitalization	5,218	4,457
Foreign Net Operating Losses	2,781	2,433
Loss Carryforwards and Other	6,338	966
Total Gross Deferred Tax Assets	32,999	33,208
Less Valuation Allowance	(17,640)	(2,433)
Total Net Deferred Tax Assets	15,359	30,775
Net Deferred Tax Asset (Liability)		$ 10,407
Deferred tax liability	$ (3,798)