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Earnings per Share (EPS): (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Numerator                      
(Loss) income from continuing operations                 $ 209,231 $ 31,546 $ 181,234
Loss from discontinued operations                 (40,156) (3,126) (41,984)
Net income attributable to noncontrolling interests                 (12,209) (3,230) (18,508)
Net (loss) income attributable to the Company 163,107 12,941 (19,216) 34 23,558 8,429 (440) (6,357) 156,866 25,190 120,742
Allocation of earnings to participating securities                 (1,436) (2,615) (3,270)
Numerator for basic earnings per share-net loss available to common stockholders                 155,430 22,575 117,472
Numerator for diluted earnings per share-net loss available to common stockholders                 $ 155,430 $ 22,575 $ 117,472
Denominator                      
Denominator for basic earnings per share - weighted average number of common shares outstanding                 131,628,000 120,346,000 81,226,000
Denominator for diluted earnings per share - weighted average number of common shares outstanding (in shares)                 131,628,000 120,346,000 81,226,000
Earnings per common share-basic:                      
Loss from continuing operations (in dollars per share)                 $ 1.46 $ 0.21 $ 1.90
Discontinued operations (in dollars per share)                 $ (0.28) $ (0.02) $ (0.45)
Net income available to common stockholders (in dollars per share) $ 1.23 $ 0.10 $ (0.15)   $ 0.18 $ 0.06 $ (0.01) $ (0.08) $ 1.18 $ 0.19 $ 1.45
Earnings per common share-diluted:                      
Loss from continuing operations (in dollars per share)                 $ 1.46 $ 0.21 $ 1.90
Discontinued operations (in dollars per share)                 $ (0.28) $ (0.02) $ (0.45)
Net income available to common stockholders (in dollars per share) $ 1.23 $ 0.10 $ (0.15)   $ 0.18 $ 0.06 $ (0.01) $ (0.08) $ 1.18 $ 0.19 $ 1.45