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Debt Debt (Schedule of Unsecured Term Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Unsecured Debt |  | $ 400,000
January 2023 [Member] |  |
Unsecured Debt | $ 125,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.99% |
November 2023 [Member] |  |
Unsecured Debt | $ 50,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.99% |
September 2024 [Member] |  |
Unsecured Debt | $ 75,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.93% |
November 2025 [Member] |  |
Unsecured Debt | $ 50,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.33% |
January 2027 [Member] |  |
Unsecured Debt | $ 100,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.51% |

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