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Summary Of Significant Accounting Policies (Redeemable Noncontrolling Interests) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 12, 2017
Feb. 12, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Rollforward of Redeemable Noncontrolling Interests          
Beginning balance     $ 143,694 $ 137,316  
Contributions     11,109 0  
Net income     3,874 2,713 $ 3,423
Distributions & Redemptions     (6,914) (16,426)  
Change in redemption value     (10,606) 20,091  
Ending balance     141,157 143,694 137,316
Redeemable Noncontrolling Interest [Line Items]          
Redemption of redeemable noncontrolling interests     $ 15,230 $ 24,102 $ 9,626
San Antonio Center          
Redeemable Noncontrolling Interest [Line Items]          
Payments to Acquire Outstanding Interest $ 2,600        
Number of downREIT units issued in connection with purchase option 44,195        
Galaxy/Hollywood          
Redeemable Noncontrolling Interest [Line Items]          
Noncontrolling interest percent acquired   10.00%      
Redemption of redeemable noncontrolling interests   $ 13,000      
Ownership interest   100.00%