Debt (Grouping Of Debt Between Fixed And Variable As Well As Secured And Unsecured) (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Schedule of Long-term Debt, By Type [Line Items]
Total	[1]	$ 2,356,528	$ 2,113,277
As To Interest Rate [Member]
Schedule of Long-term Debt, By Type [Line Items]
Fixed-rate debt (1)		2,089,769	1,869,683
Variable-rate debt		266,759	243,594
Total		2,356,528	2,113,277
As To Collateralization [Member]
Schedule of Long-term Debt, By Type [Line Items]
Unsecured debt (1)		1,913,399	1,650,521
Secured debt (1)		443,129	462,756
Total		$ 2,356,528	$ 2,113,277

[1] Consolidated variable interest entities' assets held as collateral and debt included in the above balances at December 31, 2016 and December 31, 2015 are Property, net of $476,117 and $240,689; Investment in Real Estate Joint Ventures and Partnerships, net of $0, and $18,278; Accrued Rent and Accounts Receivable, net of $11,066 and $9,245; Cash and Cash Equivalents of $9,560 and $13,250; Debt, net of $47,112 and $47,919.