Schedule III - Real Estate And Accumulated Depreciation (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Aggregate cost of land, buildings and improvements	$ 1,926,585	$ 1,848,773	$ 1,836,861
Minimum [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Useful life of buildings and improvements	7 years
Maximum [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Useful life of buildings and improvements	40 years