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)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Redeemable Noncontrolling Interest [Line Items]  
Income Attributed to Noncontrolling Interests $ (8,840)
Redemption Value Adjustment (28,865)
Redeemable noncontrolling interests as of December 31, 2017 212,208
Redeemable Noncontrolling Interests [Member]  
Redeemable Noncontrolling Interest [Line Items]  
Redeemable Noncontrolling Interests Issued 202,013
Issuance Costs (11,027)
Net 190,986
Income Attributed to Noncontrolling Interests 8,840
Distributions (8,840)
Redemption Value Adjustment 21,222
Redeemable noncontrolling interests as of December 31, 2017 212,208
Redeemable Noncontrolling Interests [Member] | Series A And Series A-1 Preferred Units [Member]  
Redeemable Noncontrolling Interest [Line Items]  
Redeemable Noncontrolling Interests Issued 52,013
Issuance Costs (464)
Net 51,549
Income Attributed to Noncontrolling Interests 1,631
Distributions (1,631)
Redemption Value Adjustment 775
Redeemable noncontrolling interests as of December 31, 2017 52,324
Redeemable Noncontrolling Interests [Member] | Rockpoint [Member]  
Redeemable Noncontrolling Interest [Line Items]  
Redeemable Noncontrolling Interests Issued 150,000
Issuance Costs (10,563)
Net 139,437
Income Attributed to Noncontrolling Interests 7,209
Distributions (7,209)
Redemption Value Adjustment 20,447
Redeemable noncontrolling interests as of December 31, 2017 $ 159,884