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Earnings Per Share ("EPS"): (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Numerator    
Income from continuing operations $ 22,526 $ 48,209
Income (loss) from discontinued operations 4 (59,932)
Net income attributable to noncontrolling interests (4,438) (2,345)
Net income (loss) attributable to the Company 18,092 (14,068)
Allocation of earnings to participating securities (66) (317)
Numerator for basic earnings per share-net income (loss) attributable to common stockholders 18,026 (14,385)
Numerator for diluted earnings per share-net income (loss) attributable to common stockholders $ 18,026 $ (14,385)
Denominator    
Denominator for basic earnings per share-weighted average number of common shares outstanding 137,538,000 132,273,000
Effect of dilutive securities:    
Share and unit-based compensation plans 78,000  
Denominator for diluted earnings per share-weighted average number of common shares outstanding 137,616,000 132,273,000
Earnings per common share-basic:    
Income from continuing operations (in dollars per share) $ 0.13 $ 0.31
Discontinued operations (in dollars per share)   $ (0.42)
Net income (loss) attributable to common stockholders (in dollars per share) $ 0.13 $ (0.11)
Earnings per common share-diluted:    
Income from continuing operations (in dollars per share) $ 0.13 $ 0.31
Discontinued operations (in dollars per share)   $ (0.42)
Net income (loss) attributable to common stockholders (in dollars per share) $ 0.13 $ (0.11)