Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt and Capital Lease Obligations
Carrying Amount	$ 2,001,618	$ 2,001,588
Fair Value	2,231,368	2,196,338
Capital lease obligations	404,985	420,800
Total debt and capital lease obligations	2,406,603	2,422,388
Less: Current portion	(61,404)	(69,791)
Long-term portion of debt and capital lease obligations	2,345,199	2,352,597
6 1/2% Senior Secured Notes due 2019
Debt and Capital Lease Obligations
Carrying Amount	1,100,000	1,100,000
Fair Value	1,212,750	1,193,500
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	1,017,000	1,001,250
Interest rate (as a percent)	7.625%
Other
Debt and Capital Lease Obligations
Carrying Amount	1,618	1,588
Fair Value	$ 1,618	$ 1,588