LONG-TERM DEBT (Details) (USD $)											0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Senior revolving credit facility	Mar. 31, 2014 9.25% Senior Notes	Dec. 31, 2013 9.25% Senior Notes	Aug. 13, 2013 9.25% Senior Notes	Mar. 31, 2014 8.875% Senior Notes	Dec. 31, 2013 8.875% Senior Notes	Jan. 14, 2013 8.875% Senior Notes	Nov. 06, 2012 8.875% Senior Notes	Dec. 19, 2013 9.75% Senior Notes	Mar. 31, 2014 9.75% Senior Notes	Dec. 31, 2013 9.75% Senior Notes	Jul. 16, 2012 9.75% Senior Notes	Mar. 31, 2014 8% convertible Note	Dec. 31, 2013 8% convertible Note	Feb. 08, 2012 8% convertible Note
Long-term debt
Long-term debt	$ 3,533,193,000	$ 3,183,823,000	$ 348,000,000	$ 400,000,000	$ 400,000,000		$ 1,371,791,000	$ 1,372,355,000				$ 1,152,029,000	$ 1,152,099,000		$ 261,373,000	$ 259,369,000
Interest rate (as a percent)				9.25%	9.25%	9.25%	8.875%	8.875%	8.875%	8.875%	9.75%	9.75%	9.75%	9.75%	8.00%	8.00%	8.00%
Deferred premiums on derivative contracts, current	1,400,000	1,400,000
Unamortized discount							5,000,000	5,100,000		5,700,000		8,600,000	8,900,000	10,200,000	28,300,000	30,300,000	43,600,000
Principal amount of debt issued											400,000,000
Unamortized premium related to debt issued							$ 26,800,000	$ 27,500,000	$ 30,000,000		$ 11,000,000	$ 10,600,000	$ 11,000,000