Real Estate Facilities (Summary Of Real Estate Assets Acquired And Liabilities Assumed - Joint Venture) (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2019
Land		$ 25,806	$ 9,668
Buildings and improvements		112,230	3,978
Other assets (in-place lease value)		6,033	$ 390
Noncontrolling interest in consolidated joint venture		$ (4,032)
JV Partner [Member]
Land	$ 21,814
Buildings and improvements	84,903
Other assets (in-place lease value)	1,199
Total consolidated joint venture	107,916
Noncontrolling interest in consolidated joint venture	(4,032)
Net book value of joint venture at consolidation	$ 103,884