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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Mar. 08, 2017
Debt Instrument [Line Items] |  |  |
Total principal amount | $ 375,000 | $ 375,000 |
Unamortized discount and debt issuance costs | 3,266 | 3,665 |
Total | 371,734 | $ 371,335 |
Unsecured Debt [Member] | Unsecured Notes One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured debt | $ 375,000 |  |
Interest rate, stated percentage | 4.40% |  | 4.40%
Unsecured Debt [Member] | Unsecured Notes Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured debt | $ 0 |  |
Minimum [Member] | LIBOR [Member] | Unsecured Debt [Member] | Unsecured Notes Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.1125% |  |
Maximum [Member] | LIBOR [Member] | Unsecured Debt [Member] | Unsecured Notes Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.1625% |  |

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