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Debt Debt (Schedule of Unsecured Term Loans) (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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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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