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Fair Value Measurements - Narrative (Details) - Swap - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |  |
Derivative, notional amount | $ 50,000,000 |  | $ 50,000,000 |
Investment expense | $ 217,000 |  | $ 290,000 |
Interest income |  | $ 56,000 |  | $ 121,000

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