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Shareholders' Equity - Stock Repurchase (Details) - USD ($) |  |  | 2 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 11, 2017 | Jan. 12, 2016 | Feb. 28, 2017 | Dec. 31, 2017 | Aug. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Aug. 16, 2017 | Feb. 16, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased (in shares) | 2,363,590 | 2,136,752 | 7,863,980 | 381,607 | 1,644,325 |  | 14,390,254 |  |
Average Price Paid per Share (in usd per share) | $ 1.54 | $ 1.35 | $ 1.58 | $ 1.41 | $ 1.40 |  | $ 1.52 |  |
Amount | $ 3,639,929 | $ 2,884,615 | $ 12,448,283 | $ 537,661 | $ 2,304,042 | $ 2,304,042 | $ 21,814,530 |  |
Maximum Dollar Value of Shares that May Yet Be Purchased Under the Plan |  |  | $ 2,551,717 | $ 4,462,339 | $ 2,158,297 |  |  | $ 5,000,000 | $ 15,000,000
Publicly Announced Repurchase Plans [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased (in shares) | 2,363,590 | 0 | 7,863,980 | 381,607 | 1,644,325 |  | 12,253,502 |  |

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