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Redeemable Noncontrolling Interests (Tables)
6 Months Ended
Jun. 30, 2012
Redeemable Noncontrolling Interests Tables [Abstract]  
Summary Of Activity Of Redeemable Noncontrolling Interests
 (Amounts in thousands)   
 Balance at December 31, 2010$ 1,327,974 
 Net income  40,539 
 Distributions  (25,711) 
 Conversion of Class A units into common shares, at redemption value  (35,208) 
 Adjustments to carry redeemable Class A units at redemption value  104,693 
 Redemption of Series D-11 redeemable units  (8,000) 
 Other, net  17,180 
 Balance at June 30, 2011$ 1,421,467 
     
 Balance at December 31, 2011$ 1,160,677 
 Net income  24,355 
 Distributions  (24,457) 
 Conversion of Class A units into common shares, at redemption value  (24,976) 
 Adjustments to carry redeemable Class A units at redemption value  110,581 
 Other, net  (9,355) 
 Balance at June 30, 2012$ 1,236,825