LONG-TERM DEBT (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Revolving Credit Facility	Dec. 31, 2011 Senior Secured Term Loan A Facility	Dec. 31, 2010 Term Loan A Facility	Dec. 31, 2011 6.50% Senior Notes due in July 2016	Mar. 08, 2011 6.50% Senior Notes due in July 2016	Dec. 31, 2010 6.50% Senior Notes due in July 2016	Dec. 31, 2011 6.75% Senior Notes due in October 2017	Dec. 31, 2010 6.75% Senior Notes due in October 2017	Dec. 31, 2011 6.875% Senior Notes due in December 2018	Dec. 31, 2010 6.875% Senior Notes due in December 2018	Dec. 31, 2011 7.00% Senior Notes due in October 2020	Dec. 31, 2010 7.00% Senior Notes due in October 2020	Dec. 31, 2011 6.75% Senior Notes due in August 2021	Feb. 08, 2011 6.75% Senior Notes due in August 2021	Dec. 31, 2010 6.75% Senior Notes due in August 2021	Dec. 31, 2011 7.25% Senior Notes due in July 2022	Mar. 08, 2011 7.25% Senior Notes due in July 2022	Dec. 31, 2010 7.25% Senior Notes due in July 2022	Dec. 31, 2011 4.00% Convertible Notes due in November, 2013	Dec. 31, 2010 4.00% Convertible Notes due in November, 2013	Dec. 31, 2009 4.00% Convertible Notes due in November, 2013	Dec. 31, 2011 5.375% Convertible Notes due in August, 2014	Dec. 31, 2010 5.375% Convertible Notes due in August, 2014	Dec. 31, 2009 5.375% Convertible Notes due in August, 2014	Jun. 10, 2009 5.375% Convertible Notes due in August, 2014	Dec. 31, 2010 Cambridge Obligation
Long-term debt, net of unamortized debt discount
Long-term debt	$ 6,651,011	$ 3,595,277	$ 220,000	$ 2,185,520	$ 975,000	$ 915,500			$ 497,949	$ 497,589	$ 938,376	$ 992,498	$ 686,228	$ 695,735	$ 650,000			$ 540,427				$ 220,792		$ 17,011	$ 196,763			$ 16,900
Less current portion	(111,250)	(116,900)
Long-term debt, noncurrent	6,539,761	3,478,377
Interest rate on debt (as a percent)						6.50%	6.50%	6.50%	6.75%	6.75%	6.875%	6.875%	7.00%	7.00%	6.75%	6.75%	6.75%	7.25%	7.25%	7.25%	4.00%	4.00%	4.00%	5.375%	5.375%	5.375%	5.375%
Unamortized debt discount	62,777			39,480					2,051	2,411	6,204	7,502	3,772	4,265				9,573				4,118		1,697	26,970			600
Total fair value of long-term debt	$ 6,700,000	$ 4,200,000