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Revenues (Schedule Of Annual Future Base Rents Due To Be Received Under Non-Cancelable Operating Leases) (Details) - USD ($) | 12 Months Ended
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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

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