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Redeemable Noncontrolling Interests (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Redeemable Noncontrolling Interests Rollforward [Abstract]      
Redeemable noncontrolling interests - begining balance $ 1,160,677 $ 1,327,974  
Net income 19,145 31,808  
Distributions (12,236) (12,702)  
Conversion of Class A redeemable units into common shares, at redemption value (13,028) (27,539)  
Adjustment to carry Class A redeemable units at redemption value 96,061 42,227  
Other, net 280 4,752  
Redeemable noncontrolling interests - ending balance 1,250,899 1,366,520  
Redeemable Noncontrolling Interests Additional Disclosure [Abstract]      
Fair value of Series G convertible preferred units and Series D-13 cumulative redeemable preferred units 55,097   54,865
Common Class A [Member]
     
Redeemable Noncontrolling Interests Additional Disclosure [Abstract]      
Temporary Equity, Redemption Value $ 1,024,899   $ 934,677
Temporary Equity Disclosure [Abstract]      
Outstanding Partnership Units held by Third Parties 12,172,197   12,160,771