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Equity - Class of Stock Disclosures - Common Stock and Shelf Registrations (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Equity |  |
Net proceeds |  | $ 14,578,000
Common Stock |  |
Equity |  |
Number of shares repurchased | 28,256 | 35,563
Common Stock | Equity Distribution Agreements |  |
Equity |  |
Maximum offering capacity under shelf registration statement | $ 200,000,000 |
Shares common stock sold |  | 312,881
Net proceeds |  | $ 14,578,000
Amount available under effective shelf registration statement | $ 185,162,000 | $ 185,162,000

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