Long-Term Debt and Capital Leases (Outstanding Long-Term Debt) (Details) (USD $)	Dec. 31, 2011		Dec. 31, 2010
ABL Credit Facility	$ 0		$ 356,000,000
Revolving Credit Facility	0		0
Capital leases	1,257,000		2,704,000
Total debt and capital lease obligations	797,574,000		358,704,000
Current portion of long-term debt	662,000		1,431,000
Long-term debt, less current portion	796,912,000		357,273,000
Senior Notes due 2021 at 4.875% [Member]
Senior notes	496,824,000	[1]	0
Senior notes, unamortized discount	3,200,000
Effective interest rate of the notes	4.945%
Senior Notes due 2021 at 4.625% [Member]
Senior notes	299,493,000	[2]	0
Senior notes, unamortized discount	$ 500,000
Effective interest rate of the notes	4.642%

[1] Net of unamortized discount of $3.2 million

[2] Net of unamortized discount of $0.5 million