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Fair Value Of Financial Instruments (Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value, Inputs, Level 1 [Member] | Common Stock, Healthcare REIT [Member] |  |
Available-for-sale Securities | $ 0 | $ 11,745,000
Fair Value, Inputs, Level 2 [Member] |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value | 747,000 | 4,279,000
Interest Rate Cash Flow Hedge Liability at Fair Value |  | $ 0
Interest Rate Swap, Date Entered, May 2012 [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 159,000 |

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