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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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	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, 2014	Dec. 31, 2013	Dec. 31, 2012
UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION
Net (loss) income	$ (212,775)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (212,775)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (104,022)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 17,887us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (11,343)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 3,264us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (128,681)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (10,982)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (26,285)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (2,654)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (20,364)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (17,351)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (311,943)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (147,742)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (66,654)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net (loss) income per share:
Basic (in dollars per share)	$ (0.71)us-gaap_EarningsPerShareBasic	$ (0.71)us-gaap_EarningsPerShareBasic	$ (0.35)us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic	$ 0.01us-gaap_EarningsPerShareBasic	$ (0.43)us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic	$ (0.10)us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (0.07)us-gaap_EarningsPerShareBasic	$ (0.07)us-gaap_EarningsPerShareBasic	$ (1.05)us-gaap_EarningsPerShareBasic	$ (0.50)us-gaap_EarningsPerShareBasic	$ (0.26)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ (0.71)us-gaap_EarningsPerShareDiluted	$ (0.71)us-gaap_EarningsPerShareDiluted	$ (0.35)us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ (0.04)us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted	$ (0.43)us-gaap_EarningsPerShareDiluted	$ (0.04)us-gaap_EarningsPerShareDiluted	$ (0.10)us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (0.07)us-gaap_EarningsPerShareDiluted	$ (0.07)us-gaap_EarningsPerShareDiluted	$ (1.05)us-gaap_EarningsPerShareDiluted	$ (0.50)us-gaap_EarningsPerShareDiluted	$ (0.26)us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding (thousands) (note 12):
Basic (in shares)	290,009us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,164us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,164us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,159us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,159us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,125us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,097us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	296,778us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	274,295us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	279,019us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	278,655us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	244,640us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,763us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,041us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	261,223us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	290,009us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	297,164us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	297,164us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	298,410us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	297,159us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	297,899us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	297,097us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	296,778us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	274,295us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	279,019us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	278,655us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	244,640us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	297,763us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	297,041us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	261,223us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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