Segment And Geographic Information (Geographic Information For Sales To External Customers And Long-Lived Assets) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Segment Reporting Information [Line Items]
Sales to external customers	$ 859,175	$ 968,372	$ 925,049	$ 867,252	$ 795,387	$ 779,677	$ 818,389	$ 778,334	$ 3,619,848	[1]	$ 3,171,787	[1]	$ 2,325,723	[1]
Long-lived assets	1,232,066				1,170,334				1,232,066		1,170,334
United States [Member]
Segment Reporting Information [Line Items]
Sales to external customers									3,221,562	[1]	2,832,980	[1]	2,088,344	[1]
Long-lived assets	1,223,073				1,159,051				1,223,073		1,159,051
Foreign [Member]
Segment Reporting Information [Line Items]
Long-lived assets	8,993				11,283				8,993		11,283
Foreign [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Sales to external customers									247,357	[1]	214,662	[1]	154,972	[1]
Foreign [Member] | Singapore [Member]
Segment Reporting Information [Line Items]
Sales to external customers									29,210	[1]	32,733	[1]	27,300	[1]
Foreign [Member] | Other [Member]
Segment Reporting Information [Line Items]
Sales to external customers									$ 121,719	[1]	$ 91,412	[1]	$ 55,107	[1]

[1] Revenues are attributed to countries based on location of customer.