Equity-Method Investment And Other Assets Equity-Method Investment And Other Assets (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) properties	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Investment [Line Items]
Equity Method Investments	$ 0	$ 7,657,000
Number of Real Estate Properties | properties	197
Net Assets Received In Acquisition of Equity-Method Investee	$ (1,506,000)	$ (6,062,000)	$ (10,304,000)
Bickford Senior Living [Member]
Investment [Line Items]
Equity Method Investments	6,443,000
Net Operating Loss Carry-forward and Deferred Tax Asset, Amount Utilized During the Period	$ 1,192,000
Number of Real Estate Properties | properties	42