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Shareholders' Equity - Share Lending Agreement (Details) - $ / shares | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2018 | Sep. 30, 2018
Equity [Abstract] |  |
Borrowed shares, number issued (in shares) | 7,479,431 | 7,479,431
Borrowed shares, public offering price per share (in usd per share) | $ 13.37 |

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