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
Mar. 31, 2018
Mar. 31, 2017
Redeemable Noncontrolling Interest [Line Items]    
Balance January 1, 2018 $ 212,208  
Income Attributed to Noncontrolling Interests (2,799) $ (792)
Redemption Value Adjustment (5,866)  
Redeemable noncontrolling interests as of March 31, 2018 225,326  
Redeemable Noncontrolling Interests [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Balance January 1, 2018 212,208  
Redeemable Noncontrolling Interests Issued 10,000  
Net 222,208  
Income Attributed to Noncontrolling Interests 2,799  
Distributions (2,799)  
Redemption Value Adjustment 3,118  
Redeemable noncontrolling interests as of March 31, 2018 225,326  
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 455  
Distributions (455)  
Redemption Value Adjustment  
Redeemable noncontrolling interests as of March 31, 2018 52,324  
Redeemable Noncontrolling Interests [Member] | Rockpoint [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Balance January 1, 2018 159,884  
Redeemable Noncontrolling Interests Issued 10,000  
Net 169,884  
Income Attributed to Noncontrolling Interests 2,344  
Distributions (2,344)  
Redemption Value Adjustment 3,118  
Redeemable noncontrolling interests as of March 31, 2018 $ 173,002