Revenues (Schedule Of Annual Future Base Rents Due To Be Received Under Non-Cancelable Operating Leases) (Details)	Dec. 31, 2018 USD ($)
Revenues [Abstract]
2019	$ 101,244,000
2020	89,291,000
2021	75,240,000
2022	63,577,000
2023	56,443,000
Thereafter	204,677,000
Future rents due to be received	$ 590,472,000