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UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unaudited supplementary quarterly information
Net (loss) income	$ (11,343)	$ 3,264	$ (128,681)	$ (10,982)	$ (26,285)	$ (2,654)	$ (20,364)	$ (17,351)	$ (16,304)	$ (23,680)	$ (13,154)	$ (8,734)	$ (147,742)	$ (66,654)	$ (61,872)
Net (loss) income per share:
Basic (in dollars per share)	$ (0.04)	$ 0.01	$ (0.43)	$ (0.04)									$ (0.50)	$ (0.26)	$ (0.42)
Diluted (in dollars per share)	$ (0.04)	$ 0.01	$ (0.43)	$ (0.04)									$ (0.50)	$ (0.26)	$ (0.42)
Basic and diluted (in dollars per share)					$ (0.10)	$ (0.01)	$ (0.07)	$ (0.07)	$ (0.11)	$ (0.16)	$ (0.08)	$ (0.06)
Weighted average shares outstanding:
Basic (in shares)	297,159	297,125	297,097	296,778									297,041	261,223	147,692
Diluted (in shares)	297,159	297,899	297,097	296,778									297,041	261,223	147,692
Weighted average shares outstanding - basic and diluted					274,295	279,019	278,655	244,640	150,399	150,371	150,292	139,560
MSC
Unaudited supplementary quarterly information
Estimated fair value of the investment in MSC					262,900	225,000								262,900
Reported
Unaudited supplementary quarterly information
Net (loss) income					(26,285)	(2,583)	(21,251)	(19,202)
Net (loss) income per share:
Basic and diluted (in dollars per share)					$ (0.10)	$ (0.01)	$ (0.08)	$ (0.08)	$ (0.12)	$ (0.17)	$ (0.09)	$ (0.07)
Weighted average shares outstanding:
Weighted average shares outstanding - basic and diluted					274,295	268,373	268,009	233,994	139,753	139,725	139,646	128,914
Adjustment
Unaudited supplementary quarterly information
Net (loss) income						$ (71)	$ 887	$ 1,851
Net (loss) income per share:
Basic and diluted (in dollars per share)							$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Weighted average shares outstanding:
Weighted average shares outstanding - basic and diluted						10,646	10,646	10,646	10,646	10,646	10,646	10,646

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