Noncontrolling Interests In Subsidiaries (Schedule Of Activity Of Noncontrolling Interests) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Noncontrolling Interest [Line Items]    
Balance, value $ 1,882,011  
Net loss (3,325) (17,628)
Common unit distributions (1,656)  
Increase in noncontrolling interest in consolidated joint ventures 94  
Balance, value 1,864,223  
Noncontrolling Interests In Subsidiaries [Member]    
Noncontrolling Interest [Line Items]    
Balance, value 257,230 276,096
Net loss (804) (2,330)
Common unit distributions (1,656) (3,455)
Increase in noncontrolling interest in consolidated joint ventures 94  
Redemption of common units for common stock (857) (6,452)
Rebalancing of ownership percentage between parent and subsidiaries 45 (21)
Balance, value $ 254,052 $ 263,838