Recent Transactions (Summary Of Income (Loss) From Property Disposed) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Real Estate Properties [Line Items]
Total revenues	$ 152,923	$ 153,715
Depreciation and amortization	(43,063)	(40,802)
Income (loss) from properties disposed of	27,229	27,008
Realized gains dispositions	58,600	144
Total income (loss) from properties disposed of	69,475	(2,835)
Disposal Group, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Total revenues	1,608	7,629
Operating and other expenses	(1,379)	(2,524)
Depreciation and amortization	(2,797)	(1,685)
Interest expense	(626)	(2,710)
Income (loss) from properties disposed of	(3,194)	710
Realized gains dispositions	58,600	144
Total income (loss) from properties disposed of	$ 55,406	$ 854