LONG-TERM DEBT (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Senior revolving credit facility	Sep. 30, 2014 9.25% Senior Notes	Dec. 31, 2013 9.25% Senior Notes	Aug. 13, 2013 9.25% Senior Notes	Sep. 30, 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	Sep. 30, 2014 9.75% Senior Notes	Dec. 31, 2013 9.75% Senior Notes	Dec. 19, 2013 9.75% Senior Notes	Jul. 16, 2012 9.75% Senior Notes	Sep. 30, 2014 8% Convertible note	Dec. 31, 2013 8% Convertible note	Feb. 08, 2012 8% Convertible note
Long-term debt
Long-term debt	$ 3,533,158,000	$ 3,183,823,000	$ 345,000,000	$ 400,000,000	$ 400,000,000		$ 1,370,630,000	$ 1,372,355,000			$ 1,151,891,000	$ 1,152,099,000			$ 265,637,000	$ 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%	8.00%	8.00%	8.00%
Deferred premiums on derivative contracts, current	700,000	1,400,000
Unamortized discount							4,700,000	5,100,000		5,700,000	8,100,000	8,900,000		10,200,000	24,000,000	30,300,000	43,600,000
Unamortized premium related to debt issued							$ 25,400,000	$ 27,500,000	$ 30,000,000		$ 10,000,000	$ 11,000,000	$ 11,000,000