Long-Term Debt (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 7 % Senior Notes due 2013	Dec. 31, 2012 7 % Senior Notes due 2013	Jun. 30, 2013 6 5/8% Senior Notes due 2014	Dec. 31, 2012 6 5/8% Senior Notes due 2014	Jun. 30, 2013 7 3/4% Senior Notes due 2015	Dec. 31, 2012 7 3/4% Senior Notes due 2015	Jun. 30, 2013 7 1/8% Senior Notes due 2016	Dec. 31, 2012 7 1/8% Senior Notes due 2016	Jun. 30, 2013 4 5/8% Senior Notes due 2017	Dec. 31, 2012 4 5/8% Senior Notes due 2017	Jun. 30, 2013 4 1/4% Senior Notes due 2018	Apr. 05, 2013 4 1/4% Senior Notes due 2018	Jun. 30, 2013 7 7/8% Senior Notes due 2019	Dec. 31, 2012 7 7/8% Senior Notes due 2019	Jun. 30, 2013 5 1/8% Senior Notes due 2020	Apr. 05, 2013 5 1/8% Senior Notes due 2020	Jun. 30, 2013 6 3/4% Senior Notes due 2021	Dec. 31, 2012 6 3/4% Senior Notes due 2021	Jun. 30, 2013 5 7/8% Senior Notes due 2022	Dec. 31, 2012 5 7/8% Senior Notes due 2022	Jun. 30, 2013 5% Senior Notes due 2023	Dec. 31, 2012 5% Senior Notes due 2023	Jun. 30, 2013 Mortgages and other notes payable	Dec. 31, 2012 Mortgages and other notes payable
Long-term debt
Carrying Value	$ 13,912,166	$ 11,615,427	$ 500,000	$ 500,000	$ 1,000,000	$ 1,000,000	$ 750,000	$ 750,000	$ 1,500,000	$ 1,500,000	$ 900,000	$ 900,000	$ 1,200,000		$ 1,400,000	$ 1,400,000	$ 1,100,000		$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 1,500,000	$ 1,500,000	$ 62,166	$ 65,427
Fair Value	14,374,491	12,783,027	505,950	521,875	1,042,500	1,078,500	811,875	844,725	1,623,750	1,683,750	906,750	940,500	1,161,000		1,555,750	1,669,500	1,097,250		2,130,000	2,280,000	2,030,000	2,150,000	1,447,500	1,548,750	62,166	65,427
Capital lease obligations	233,504	248,304
Total long-term debt and capital lease obligations (including current portion)	$ 14,145,670	$ 11,863,731
Interest rate (as a percent)			7.00%	7.00%	6.625%	6.625%	7.75%	7.75%	7.125%	7.125%	4.625%	4.625%	4.25%	4.25%	7.875%	7.875%	5.125%	5.125%	6.75%	6.75%	5.875%	5.875%	5.00%	5.00%