Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt and Capital Lease Obligations
Carrying Amount	$ 2,001,452	$ 2,002,041
Fair Value	2,142,202	2,238,491
Capital lease obligations	431,331	486,458
Total debt and capital lease obligations	2,432,783	2,488,499
Less: Current portion	(68,662)	(67,706)
Long-term portion of debt and capital lease obligations	2,364,121	2,420,793
6 1/2% Senior Secured Notes due 2019
Debt and Capital Lease Obligations
Carrying Amount	1,100,000	1,100,000
Fair Value	1,168,750	1,210,000
Interest rate (as a percent)	6.50%
7 5/8% Senior Notes due 2021
Debt and Capital Lease Obligations
Carrying Amount	900,000	900,000
Fair Value	972,000	1,026,450
Interest rate (as a percent)	7.625%
Other
Debt and Capital Lease Obligations
Carrying Amount	1,452	2,041
Fair Value	$ 1,452	$ 2,041