EARNINGS (LOSS) PER SHARE (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings (Loss) Per Share
Net earnings (loss)	$ 33,439	$ (511,173)	$ (34,509)	$ (543,846)
Less: net earnings attributable to participating securities	(1,014)	0	0	0
Net earnings (loss) for basic and diluted earnings (loss) per share	$ 32,425	$ (511,173)	$ (34,509)	$ (543,846)
Weighted Average Number of Shares Outstanding Reconciliation
Weighted average common shares outstanding during the period for basic earnings (loss) per share	116,033	115,107	115,845	114,464
Dilutive effects of potential common shares	0	0	0	0
Weighted average common shares outstanding during the period, including the effects of dilutive potential common shares, for diluted earnings (loss) per share	116,033	115,107	115,845	114,464