Income Taxes (Schedule of Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for doubtful accounts	$ 2,686	$ 2,492
Tax credits	9,363	11,747
Other accruals	153,955	151,635
Net operating losses	304	337
Other	19,870	19,051
Total deferred tax assets	186,178	185,262
Deferred tax liabilities:
Inventories	76,694	82,313
Property and equipment	157,228	141,930
Other	42,422	40,791
Total deferred tax liabilities	276,344	265,034
Net deferred tax liabilities	$ (90,166)	$ (79,772)