Real Estate Facilities (Summary Of Real Estate Assets Acquired And Liabilities Assumed) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Real Estate Facilities [Abstract]
Land	$ 9,668	$ 25,806
Buildings and improvements	3,978	112,230
Other assets (above-market in-place rents)		1,487
Accrued and other liabilities (below-market in-place rents)	(212)	(1,790)
Other assets (in-place lease value)	390	6,033
Total purchase price	13,824	143,766
Net operating assets acquired and liabilities assumed	(88)	(1,367)
Total cash paid	$ 13,736	$ 142,399