Debt (Grouping Of Debt Between Fixed And Variable As Well As Secured And Unsecured) (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total	[1]	$ 1,793,128	$ 2,081,152
As To Interest Rate [Member]
Debt Instrument [Line Items]
Fixed-rate debt		1,775,381	2,063,263
Variable-rate debt		17,747	17,889
Total		1,793,128	2,081,152
As To Collateralization [Member]
Debt Instrument [Line Items]
Unsecured debt		1,455,225	1,667,462
Secured debt		337,903	413,690
Total		$ 1,793,128	$ 2,081,152

[1] Consolidated variable interest entities' assets and debt included in the above balances (see Note 15) at September 30, 2018 and December 31, 2017 are Property, net of $200,276 and $207,969; Accrued Rent, Accrued Contract Receivables and Accounts Receivable, net of $11,239 and $12,011; Cash and Cash Equivalents of $8,989 and $9,025; Debt, net of $45,964 and $46,253.