Revenues (Schedule Of Annual Future Base Rents Due To Be Received Under Non-Cancelable Operating Leases) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues [Abstract]
2017	$ 101,880,000
2018	93,063,000
2019	79,220,000
2020	63,742,000
2021	49,311,000
Thereafter	213,217,000
Future rents due to be received	600,433,000
Expense recoveries	$ 32,700,000	$ 32,600,000	$ 32,100,000