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Shareholders' Equity - Stock Repurchase (Details) - USD ($) |  |  | 1 Months Ended | 4 Months Ended | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 11, 2017 | Jan. 12, 2016 | Aug. 31, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | Feb. 28, 2017 | Jan. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | 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 | 1,377,325 | 102,000 | 165,000 | 448,000 | 867,507 | 381,607 |  |  | 6,548,473 | 14,390,254 |  |
Average Price Paid per Share (in usd per share) | $ 1.54 | $ 1.35 | $ 1.40 | $ 1.41 | $ 1.40 | $ 1.48 | $ 1.60 | $ 1.41 |  |  | $ 1.59 | $ 1.52 |  |
Amount | $ 3,639,929 | $ 2,884,615 | $ 1,929,222 | $ 143,820 | $ 231,000 | $ 662,356 | $ 1,384,021 | $ 537,661 | $ 2,304,042 | $ 6,223,967 | $ 10,401,906 | $ 21,814,530 |  |
Maximum Dollar Value of Shares that May Yet Be Purchased Under the Plan |  |  | $ 2,158,297 | $ 4,087,519 | $ 4,231,339 | $ 2,551,717 | $ 3,214,073 | $ 4,462,339 |  | $ 4,462,339 | $ 4,598,094 |  | $ 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 | 1,377,325 | 102,000 | 165,000 | 448,000 | 867,507 | 381,607 |  |  | 6,548,473 | 12,253,502 |  |

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