LONG-TERM DEBT (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Senior revolving credit facility	Dec. 31, 2012 8.875% Notes	Nov. 06, 2012 8.875% Notes	Dec. 31, 2012 9.75% Senior Notes	Jul. 16, 2012 9.75% Senior Notes	Dec. 31, 2012 8% Note	Feb. 08, 2012 8% Note	Dec. 31, 2011 Revolving credit facility	Dec. 31, 2011 Term loan facility	Dec. 31, 2012 Promissory Notes
Long-term debt
Long-term debt	$ 2,034,498,000	$ 202,000,000	$ 298,000,000	$ 744,421,000		$ 740,232,000		$ 251,845,000		$ 127,000,000	$ 75,000,000
Interest rate (as a percent)				8.875%	8.875%	9.75%	9.75%	8.00%	8.00%
Principal amount				750,000,000	750,000,000	750,000,000	750,000,000	275,000,000	275,000,000			75,285,000
Long-term debt, current	74,669,000											74,700,000
Unamortized discount				$ 5,580,000	$ 5,650,000	$ 9,800,000	$ 10,200,000	$ 37,800,000	$ 43,600,000