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Fair Values (Schedule of Fair Value Measurement) (Details) $ in Thousands | Dec. 31, 2017 USD ($) | Sep. 30, 2018 USD ($)
--- | --- | ---
Recurring basis | Fair Value |  |
Assets and liabilities recorded at fair value |  |
Derivative assets |  | $ 10,303
Available-for-sale securities | $ 22,842 | 21,282
Recurring basis | Quoted market prices in active markets (Level 1) |  |
Assets and liabilities recorded at fair value |  |
Derivative assets |  | 0
Available-for-sale securities | 0 | 0
Recurring basis | Significant other observable inputs (Level 2) |  |
Assets and liabilities recorded at fair value |  |
Derivative assets |  | 10,303
Recurring basis | Significant unobservable inputs (Level 3) |  |
Assets and liabilities recorded at fair value |  |
Available-for-sale securities | 22,842 | $ 21,282
Non-recurring basis | Fair Value |  |
Assets and liabilities recorded at fair value |  |
Impaired real estate | 12,400 |
Impaired real estate available and held for sale | 800 |
Impaired land and development | 21,400 |
Non-recurring basis | Quoted market prices in active markets (Level 1) |  |
Assets and liabilities recorded at fair value |  |
Impaired real estate available and held for sale | 0 |
Impaired land and development | 0 |
Non-recurring basis | Significant other observable inputs (Level 2) |  |
Assets and liabilities recorded at fair value |  |
Impaired land and development | 0 |
Non-recurring basis | Significant unobservable inputs (Level 3) |  |
Assets and liabilities recorded at fair value |  |
Impaired real estate | 12,400 |
Impaired real estate available and held for sale | 800 |
Impaired land and development | $ 21,400 |
Non-recurring basis | Significant unobservable inputs (Level 3) | Discount Rate |  |
Assets and liabilities recorded at fair value |  |
Land and development asset, measurement input | 0.06 |
Non-recurring basis | Significant unobservable inputs (Level 3) | Holding Period |  |
Assets and liabilities recorded at fair value |  |
Land and development asset, measurement input, term | 10 years |
Non-recurring basis | Significant unobservable inputs (Level 3) | Fair Value |  |
Assets and liabilities recorded at fair value |  |
Impaired real estate | $ 12,400 |
Impaired land and development | $ 21,400 |

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