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, 2020
Dec. 31, 2019
Dec. 31, 2018
Redeemable Noncontrolling Interest [Line Items]      
Balance $ 503,382,000    
Income Attributed to Noncontrolling Interests (25,883,000) $ (22,615,000) $ (13,979,000)
Redemption Value Adjustment (38,951,000) (51,355,000) (26,700,000)
Redeemable noncontrolling interests 513,297,000 503,382,000  
Redeemable Noncontrolling Interests [Member]      
Redeemable Noncontrolling Interest [Line Items]      
Balance 503,382,000 330,459,000  
Redeemable Noncontrolling Interests Issued (net of issuance)   143,450,000  
Net 503,382,000 473,909,000  
Income Attributed to Noncontrolling Interests 25,883,000 22,615,000  
Distributions (25,883,000) (22,615,000)  
Other Distributions (3,153,000)    
Redemption Value Adjustment 13,068,000 29,473,000  
Redeemable noncontrolling interests 513,297,000 503,382,000 330,459,000
Issuance Costs   1,500,000  
Redeemable Noncontrolling Interests [Member] | Series A And Series A-1 Preferred Units In MCRLP [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 451,058,000 278,135,000  
Redeemable Noncontrolling Interests Issued (net of issuance)   143,450,000  
Net 451,058,000 421,585,000  
Income Attributed to Noncontrolling Interests 24,063,000 20,795,000  
Distributions (24,063,000) (20,795,000)  
Other Distributions (3,153,000)    
Redemption Value Adjustment 13,068,000 29,473,000  
Redeemable noncontrolling interests $ 460,973,000 $ 451,058,000 $ 278,135,000