Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Long-Term Debt (Details 2) (USD $)	9 Months Ended			1 Months Ended	3 Months Ended
Long-Term Debt (Details 2) (USD $)	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Oct. 31, 2011 6 3/8% Senior Notes due 2011	Sep. 30, 2011 6 3/8% Senior Notes due 2011	Dec. 31, 2010 6 3/8% Senior Notes due 2011	Sep. 30, 2011 7 % Senior Notes due 2013	Dec. 31, 2010 7 % Senior Notes due 2013	Sep. 30, 2011 6 5/8% Senior Notes due 2014	Dec. 31, 2010 6 5/8% Senior Notes due 2014	Sep. 30, 2011 7 3/4% Senior Notes due 2015	Dec. 31, 2010 7 3/4% Senior Notes due 2015	Sep. 30, 2011 7 1/8% Senior Notes due 2016	Dec. 31, 2010 7 1/8% Senior Notes due 2016	Sep. 30, 2011 7 7/8% Senior Notes due 2019	Dec. 31, 2010 7 7/8% Senior Notes due 2019	Sep. 30, 2011 6 3/4% Senior Notes due 2021	May 05, 2011 6 3/4% Senior Notes due 2021	Sep. 30, 2011 Mortgages and other notes payable	Dec. 31, 2010 Mortgages and other notes payable
Long-term debt
Carrying Value	$ 8,136,872,000	$ 6,227,965,000			$ 914,642,000	$ 1,000,000,000	$ 500,000,000	$ 500,000,000	$ 1,000,000,000	$ 1,000,000,000	$ 750,000,000	$ 750,000,000	$ 1,500,000,000	$ 1,500,000,000	$ 1,400,000,000	$ 1,400,000,000	$ 2,000,000,000		$ 72,230,000	$ 77,965,000
Fair Value	8,197,942,000	6,486,130,000			914,642,000	1,032,500,000	527,000,000	532,815,000	1,035,000,000	1,032,500,000	778,125,000	798,750,000	1,515,945,000	1,548,600,000	1,435,000,000	1,463,000,000	1,920,000,000		72,230,000	77,965,000
Capital lease obligations	270,610,000	286,971,000
Long-term debt and capital lease obligations (including current portion)	8,407,482,000	6,514,936,000
Interest rate (as a percent)	6.375%		6.375%				7.00%	7.00%	6.625%	6.625%	7.75%	7.75%	7.125%	7.125%	7.875%	7.875%	6.75%	6.75%
Repurchases of senior notes	85,358,000				85,000,000
Repayments of debt				$ 915,000,000