Net Change in Operating Accounts (Effect Of Changes In The Operating Accounts On Cash Flows From Operating Activities) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Increase (Decrease) in Operating Capital [Abstract]
Other assets, net	$ (10,135)	$ (3,938)
Accounts payable and accrued expenses	(1,356)	33
Accrued real estate taxes	20,986	22,564
Other liabilities	1,178	3,281
Other	2,134	2,226
Change in operating accounts and other	$ 12,807	$ 24,166