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Fair Values (Schedule of Fair Value Measurement) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Assets and liabilities recorded at fair value |  |  |
Preferred equity security, face value | $ 100,000 | $ 100,000 |
Preferred equity security, mandatory redemption period | 5 years |  |
Recurring basis | Quoted market prices in active markets (Level 1) |  |  |
Assets and liabilities recorded at fair value |  |  |
Derivative assets | $ 0 | 0 |
Derivative liabilities | 0 | 0 |
Available-for-sale securities | 0 | 0 | $ 0
Recurring basis | Significant other observable inputs (Level 2) |  |  |
Assets and liabilities recorded at fair value |  |  |
Derivative assets | 8,120 | 8,120 |
Derivative liabilities | 1,150 | 1,150 |
Recurring basis | Significant unobservable inputs (Level 3) |  |  |
Assets and liabilities recorded at fair value |  |  |
Available-for-sale securities | 21,840 | 21,840 | 22,842
Non-recurring basis | Quoted market prices in active markets (Level 1) |  |  |
Assets and liabilities recorded at fair value |  |  |
Impaired real estate | 0 | 0 |
Impaired real estate available and held for sale |  |  | 0
Impaired land and development | 0 | 0 | 0
Non-recurring basis | Significant other observable inputs (Level 2) |  |  |
Assets and liabilities recorded at fair value |  |  |
Impaired land and development | 0 | 0 | 0
Non-recurring basis | Significant unobservable inputs (Level 3) |  |  |
Assets and liabilities recorded at fair value |  |  |
Impaired real estate | 5,632 | 5,632 | 12,400
Impaired real estate available and held for sale |  |  | 800
Impaired land and development | 8,873 | 8,873 | 21,400
Debt security | 77,007 | 77,007 |
Preferred equity security, fair value | 77,000 | 77,000 |
Fair Value | Recurring basis |  |  |
Assets and liabilities recorded at fair value |  |  |
Derivative assets | 8,120 | 8,120 |
Derivative liabilities | 1,150 | 1,150 |
Available-for-sale securities | 21,840 | 21,840 | 22,842
Fair Value | Non-recurring basis |  |  |
Assets and liabilities recorded at fair value |  |  |
Impaired real estate | 5,632 | 5,632 | 12,400
Impaired real estate available and held for sale |  |  | 800
Impaired land and development | $ 8,873 | $ 8,873 | $ 21,400
Loans Receivable and Other Lending Investments, Net [Member] | Fair Value | Non-recurring basis |  |  |
Assets and liabilities recorded at fair value |  |  |
Discount rate |  | 7.375% |
Land and Land Development Asset | Fair Value | Non-recurring basis |  |  |
Assets and liabilities recorded at fair value |  |  |
Discount rate |  |  | 6.00%
Estimated sales period |  |  | 10 years

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