Income Taxes (Schedule of Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for doubtful accounts	$ 2,492	$ 2,357
Tax credits	11,747	14,725
Other accruals	151,635	131,436
Net operating losses	337	746
Other	19,051	16,468
Total deferred tax assets	185,262	165,732
Deferred tax liabilities:
Inventories	82,313	90,333
Property and equipment	141,930	139,604
Other	40,791	38,217
Total deferred tax liabilities	265,034	268,154
Net deferred tax liabilities	$ (79,772)	$ (102,422)