EARNINGS (LOSS) PER SHARE (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings (Loss) Per Share
Net earnings (loss)	$ (458,552)	$ 87,718	$ (1,002,398)	$ 123,362
Net earnings attributable to noncontrolling interest	0	(4,923)	0	(4,987)
Net earnings attributable to participating securities	0	(1,863)	0	(2,413)
Net earnings (loss) attributable to common stock for basic earnings per share	(458,552)	80,932	(1,002,398)	115,962
Adjustment for liability classified stock-based compensation awards	0	(603)	0	(707)
Net earnings (loss) for diluted earnings per share	(458,552)	80,329	(1,002,398)	115,255
Weighted Average Number of Shares Outstanding Reconciliation
Weighted average common shares outstanding during the period for basic earnings (loss) per share (in shares)	115,417	111,810	114,784	111,598
Dilutive effects of potential common shares (in shares)	0	352	0	521
Weighted average common shares outstanding during the period, including the effects of dilutive potential common shares, for diluted earnings (loss) per share (in shares)	115,417	112,162	114,784	112,119
Continuing Operations
Earnings (Loss) Per Share
Net earnings (loss)	(458,552)	59,610	(1,002,398)	78,793
Net earnings attributable to noncontrolling interest	0	0	0	0
Net earnings attributable to participating securities	0	(1,341)	0	(1,606)
Net earnings (loss) attributable to common stock for basic earnings per share	(458,552)	58,269	(1,002,398)	77,187
Adjustment for liability classified stock-based compensation awards	0	0	0	0
Net earnings (loss) for diluted earnings per share	(458,552)	58,269	(1,002,398)	77,187
Discontinued Operations
Earnings (Loss) Per Share
Net earnings (loss)	0	28,108	0	44,569
Net earnings attributable to noncontrolling interest	0	(4,923)	0	(4,987)
Net earnings attributable to participating securities	0	(522)	0	(807)
Net earnings (loss) attributable to common stock for basic earnings per share	0	22,663	0	38,775
Adjustment for liability classified stock-based compensation awards	0	(603)	0	(707)
Net earnings (loss) for diluted earnings per share	$ 0	$ 22,060	$ 0	$ 38,068