Schedule III - Real Estate And Accumulated Depreciation (Reconciliation Of Real Estate and Accumulated Depreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Real Estate [Roll Forward]
Balance at beginning of year	$ 1,864,382	$ 1,629,312	$ 1,520,151
Additions during the year	135,056	333,889	275,032
Dispositions / Deconsolidation of consolidated joint venture during the year		(98,819)	(156,504)
Changes/Impairments in Assets Held for Sale			(9,367)
Investment in Real Estate				$ 1,999,438	$ 1,864,382	$ 1,629,312
Total Real Estate	1,864,382	1,629,312	1,520,151	$ 1,999,438	$ 1,864,382	$ 1,629,312
Reconciliation of Accumulated Depreciation [Roll Forward]
Balance at beginning of year	189,889	162,189	150,353
Depreciation for year	47,240	43,218	39,771
Changes/Impairments in Assets Held for Sale			51
Accumulated depreciation on assets sold		(15,518)	(27,986)
Balance at end of year	$ 237,129	$ 189,889	$ 162,189