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Redeemable Noncontrolling Interests (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended 0 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Common Class A [Member]
Dec. 31, 2011
Common Class A [Member]
Jul. 19, 2012
Series D10 Cumulative Redeemable Preferred Unit [Member]
Subsequent Event [Member]
Jul. 19, 2012
Series D14 Cumulative Redeemable Preferred Unit [Member]
Subsequent Event [Member]
Jul. 19, 2012
Series D10 And Series D-14 Cumulative Redeemable Preferred Unit [Member]
Subsequent Event [Member]
Redeemable Noncontrolling Interests Rollforward [Abstract]                
Redeemable noncontrolling interests - beginning balance $ 1,160,677 $ 1,327,974            
Net income 24,355 40,539            
Distributions (24,457) (25,711)            
Conversion of Class A redeemable units into common shares, at redemption value (24,976) (35,208)            
Adjustment to carry Class A redeemable units at redemption value 110,581 104,693            
Cumulative Redeemable Preferred Units Redemption Amount   (8,000)           (180,000)
Other, net (9,355) 17,180            
Redeemable noncontrolling interests - ending balance 1,236,825 1,421,467            
Redeemable Noncontrolling Interests Additional Disclosure [Abstract]                
Temporary Equity, Redemption Value       1,010,825 934,677      
Fair value of Series G convertible preferred units and Series D-13 cumulative redeemable preferred units 55,097   54,865          
Dividend Percentage           7.00% 6.75%  
Cumulative Redeemable Preferred Units Redemption Amount   8,000           180,000
Payments for Repurchase of Redeemable Noncontrolling Interest               $ 168,300
Temporary Equity Disclosure [Abstract]                
Outstanding Partnership Units held by Third Parties       12,036,494 12,160,771