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Equity - Class of Stock Disclosures - Common Stock and Shelf Registrations (Details) - Common Stock - USD ($) | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Equity |  |
Number of shares repurchased | 45,030 | 31,326
Equity Distribution Agreements |  |
Equity |  |
Maximum offering capacity under shelf registration statement | $ 200,000,000 |
Shares common stock sold | 0 |
Amount available under effective shelf registration statement | $ 200,000,000 |

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