Net Change in Operating Accounts (Effect Of Changes In The Operating Accounts On Cash Flows From Operating Activities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Increase (Decrease) in Operating Capital [Abstract]
Other assets, net	$ 6,073	$ 5,494
Accounts payable and accrued expenses	1,768	(14,191)
Accrued real estate taxes	(19,722)	(15,857)
Other liabilities	(5,779)	(1,238)
Other	740	732
Change in operating accounts and other	$ (16,920)	$ (25,060)