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Issuances of Common Stock - Dividend Reinvestment and Stock Purchase Plan (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Dividend Reinvestment and Stock Purchase Plan |  |
Gross proceeds | $ 2,366 | $ 2,164
Dividend Reinvestment and Stock Purchase Plan |  |
Dividend Reinvestment and Stock Purchase Plan |  |
Common shares authorized for future issuance (in shares) | 26,000,000 |
Common shares remaining for future issuance (in shares) | 11,618,668 |
Common stock | Dividend Reinvestment and Stock Purchase Plan |  |
Dividend Reinvestment and Stock Purchase Plan |  |
Shares of common stock issued (in shares) | 34,000 | 31,898
Gross proceeds | $ 2,400 | $ 2,200

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