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Fair Value Of Financial Instruments (Schedule Of Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Fair Value, Inputs, Level 2 [Member] |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | $ 15 | $ 0
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value | 2,492 | 4,279
Common Stock, Healthcare REIT [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale Securities | $ 0 | $ 11,745

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