Income Taxes (Schedule of Components of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current deferred tax assets:
Allowance for doubtful accounts	$ 1,933	$ 2,683
Unrealized loss on cash flow hedges	0	1,875
Net operating losses	0	1,893
Tax credits	541	5,437
Other accruals	55,209	78,479
Total current deferred tax assets:	57,683	90,367
Noncurrent deferred tax assets:
Tax credits	4,605	3,558
Net operating losses	3,008	3,408
Other accruals	50,855	20,464
Total noncurrent deferred tax assets:	58,468	27,430
Total deferred tax assets	116,151	117,797
Current deferred tax liabilities:
Inventories	59,673	56,490
Total current deferred tax liabilities:	59,673	56,490
Noncurrent deferred tax liabilities:
Property and equipment	138,132	95,300
Other	9,200	866
Total noncurrent deferred tax liabilities:	147,332	96,166
Total deferred tax liabilities	207,005	152,656
Net deferred tax liabilities	$ (90,854)	$ (34,859)