Annual report pursuant to Section 13 and 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 ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Redeemable Noncontrolling Interest [Line Items]      
Balance $ 330,459,000    
Income Attributed to Noncontrolling Interests (22,615,000) $ (13,979,000) $ (8,840,000)
Redemption Value Adjustment (including value adjustment attributable to Add On Investment Agreement) (51,355,000) (26,700,000) (28,865,000)
Redeemable noncontrolling interests 503,382,000 330,459,000  
Redeemable Noncontrolling Interests [Member]      
Redeemable Noncontrolling Interest [Line Items]      
Balance 330,459,000 212,208,000  
Redeemable Noncontrolling Interests Issued (issuance costs) 143,450,000 105,000,000  
Net 473,909,000 317,208,000  
Income Attributed to Noncontrolling Interests 22,615,000 13,979,000  
Distributions (22,615,000) (13,979,000)  
Redemption Value Adjustment (including value adjustment attributable to Add On Investment Agreement) 29,473,000 13,251,000  
Redeemable noncontrolling interests 503,382,000 330,459,000 212,208,000
Issuance Costs 1,500,000    
Redeemable Noncontrolling Interests [Member] | Series A And Series A-1 Preferred Units [Member]      
Redeemable Noncontrolling Interest [Line Items]      
Balance 52,324,000 52,324,000  
Net 52,324,000 52,324,000  
Income Attributed to Noncontrolling Interests 1,820,000 1,820,000  
Distributions (1,820,000) (1,820,000)  
Redeemable noncontrolling interests 52,324,000 52,324,000 52,324,000
Redeemable Noncontrolling Interests [Member] | Rockpoint [Member]      
Redeemable Noncontrolling Interest [Line Items]      
Balance 278,135,000 159,884,000  
Redeemable Noncontrolling Interests Issued (issuance costs) 143,450,000 105,000,000  
Net 421,585,000 264,884,000  
Income Attributed to Noncontrolling Interests 20,795,000 12,159,000  
Distributions (20,795,000) (12,159,000)  
Redemption Value Adjustment (including value adjustment attributable to Add On Investment Agreement) 29,473,000 13,251,000  
Redeemable noncontrolling interests $ 451,058,000 $ 278,135,000 $ 159,884,000