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EARNINGS (LOSS) PER SHARE (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings (Loss) Per Share        
Net earnings (loss) $ (511,173) $ 38,974 $ (543,846) $ 35,644
Net earnings attributable to noncontrolling interest 0 (64) 0 (64)
Net earnings attributable to participating securities 0 (725) 0 (687)
Net earnings (loss) attributable to common stock for basic earnings per share (511,173) 38,185 (543,846) 34,893
Adjustment for liability classified stock-based compensation awards 0 (145) 0 (102)
Net earnings (loss) for diluted earnings per share (511,173) 38,040 (543,846) 34,791
Weighted average common shares outstanding during the period for basic earnings (loss) per share (in shares) 115,107 111,636 114,464 111,490
Dilutive effects of potential common shares (in shares) 0 540 0 570
Weighted average common shares outstanding during the period, including the effects of dilutive potential common shares, for diluted earnings (loss) per share (in shares) 115,107 112,176 114,464 112,060
Continuing Operations
       
Earnings (Loss) Per Share        
Net earnings (loss) (511,173) 29,104 (543,846) 19,183
Net earnings attributable to noncontrolling interest 0 0 0 0
Net earnings attributable to participating securities 0 (542) 0 (371)
Net earnings (loss) attributable to common stock for basic earnings per share (511,173) 28,562 (543,846) 18,812
Adjustment for liability classified stock-based compensation awards 0 0 0 0
Net earnings (loss) for diluted earnings per share (511,173) 28,562 (543,846) 18,812
Discontinued Operations
       
Earnings (Loss) Per Share        
Net earnings (loss) 0 9,870 0 16,461
Net earnings attributable to noncontrolling interest 0 (64) 0 (64)
Net earnings attributable to participating securities 0 (183) 0 (316)
Net earnings (loss) attributable to common stock for basic earnings per share 0 9,623 0 16,081
Adjustment for liability classified stock-based compensation awards 0 (145) 0 (102)
Net earnings (loss) for diluted earnings per share $ 0 $ 9,478 $ 0 $ 15,979