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Stockholder's Equity (Details 4) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Summary of comprehensive income/(loss)        
Unrecognized gain (losses) on cash flow hedges $ 386 $ (4,208) $ 868 $ (5,498)
Unrecognized gains on equity investments (236) (227) 86 (137)
Total other comprehensive income (loss) 150 (4,435) 954 (5,635)
Net income attributable to controlling interests 87,200 51,130 119,252 82,451
Comprehensive income attributable to controlling interests 87,350 46,695 120,206 76,816
Less: Net income (loss) attributable to noncontrolling interests(1) (992) [1] (66) [1] (1,234) [1] 307 [1]
Total comprehensive income $ 86,358 $ 46,629 $ 118,972 $ 77,123
[1] Includes amounts attributable to redeemable noncontrolling interests.