Debt (Grouping Of Debt Between Fixed And Variable As Well As Secured And Unsecured) (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total	[1]	$ 2,214,319	$ 2,356,528
As To Interest Rate [Member]
Debt Instrument [Line Items]
Fixed-rate debt		2,067,772	2,089,769
Variable-rate debt		146,547	266,759
Total		2,214,319	2,356,528
As To Collateralization [Member]
Debt Instrument [Line Items]
Unsecured debt		1,794,931	1,913,399
Secured debt		419,388	443,129
Total		$ 2,214,319	$ 2,356,528

[1] Consolidated variable interest entities' assets and debt included in the above balances (see Note 15) at September 30, 2017 and December 31, 2016 are Property, net of $210,184 and $476,117; Accrued Rent and Accounts Receivable, net of $11,385 and $11,066; Cash and Cash Equivalents of $8,457 and $9,560; Debt, net of $46,473 and $47,112.