Quarterly report pursuant to Section 13 or 15(d)

Redeemable Noncontrolling Interests (Schedule Of Changes In The Value Of The Redeemable Noncontrolling Interests) (Details)

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Redeemable Noncontrolling Interests (Schedule Of Changes In The Value Of The Redeemable Noncontrolling Interests) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Redeemable Noncontrolling Interest [Line Items]        
Balance January 1, 2018     $ 212,208  
Income Attributed to Noncontrolling Interests $ (2,989) $ (2,682) (5,788) $ (3,474)
Redemption Value Adjustment     (12,618)  
Redeemable noncontrolling interests as of June 30, 2018 284,215   284,215  
Redeemable Noncontrolling Interests [Member]        
Redeemable Noncontrolling Interest [Line Items]        
Balance January 1, 2018     212,208  
Redeemable Noncontrolling Interests Issued     65,000  
Net     277,208  
Income Attributed to Noncontrolling Interests     5,788  
Distributions     (5,788)  
Redemption Value Adjustment     7,007  
Redeemable noncontrolling interests as of June 30, 2018 284,215   284,215  
Redeemable Noncontrolling Interests [Member] | Series A And Series A-1 Preferred Units [Member]        
Redeemable Noncontrolling Interest [Line Items]        
Balance January 1, 2018     52,324  
Redeemable Noncontrolling Interests Issued      
Net     52,324  
Income Attributed to Noncontrolling Interests     910  
Distributions     (910)  
Redemption Value Adjustment      
Redeemable noncontrolling interests as of June 30, 2018 52,324   52,324  
Redeemable Noncontrolling Interests [Member] | Rockpoint [Member]        
Redeemable Noncontrolling Interest [Line Items]        
Balance January 1, 2018     159,884  
Redeemable Noncontrolling Interests Issued     65,000  
Net     224,884  
Income Attributed to Noncontrolling Interests     4,878  
Distributions     (4,878)  
Redemption Value Adjustment     7,007  
Redeemable noncontrolling interests as of June 30, 2018 $ 231,891   $ 231,891