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Issuances of Common Stock - Dividend Reinvestment and Stock Purchase Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividend Reinvestment and Stock Purchase Plan |  |  |
Gross proceeds | $ 9,109 | $ 8,437 | $ 9,114
DRSPP |  |  |
Dividend Reinvestment and Stock Purchase Plan |  |  |
Dividend Reinvestment and Stock Purchase Plan, authorized shares (in shares) | 26,000,000 |  |
Shares remaining for future issuance (in shares) | 11,503,379 |  |
Common stock | DRSPP |  |  |
Dividend Reinvestment and Stock Purchase Plan |  |  |
Shares of common stock issued (in shares) | 149,289 | 117,522 | 116,268
Gross proceeds | $ 9,100 | $ 8,400 | $ 9,100

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