Debt (Grouping Of Debt Between Fixed And Variable As Well As Secured And Unsecured) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total	[1]	$ 1,928,570	$ 2,081,152
As To Interest Rate [Member]
Debt Instrument [Line Items]
Fixed-rate debt		1,910,741	2,063,263
Variable-rate debt		17,829	17,889
Total		1,928,570	2,081,152
As To Collateralization [Member]
Debt Instrument [Line Items]
Unsecured debt		1,554,955	1,667,462
Secured debt		373,615	413,690
Total		$ 1,928,570	$ 2,081,152

[1] Consolidated variable interest entities' assets and debt included in the above balances (see Note 15) at March 31, 2018 and December 31, 2017 are Property, net of $205,484 and $207,969; Accrued Rent and Accounts Receivable, net of $10,324 and $12,011; Cash and Cash Equivalents of $8,754 and $9,025; Debt, net of $46,030 and $46,253.