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Share Capital, Common Stock (Details) - USD ($) |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2010 | Jul. 01, 2008 | Nov. 30, 2019 | Oct. 31, 2019 | Jun. 30, 2019 | Feb. 28, 2019 | Feb. 05, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Feb. 21, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares (in shares) | 0 |  |  |  |  |  |  |  | 458,088 |  |  | 0 | 458,088 |  |
Ordinary shares issued (in shares) |  |  |  | 3,963,964 |  |  |  |  |  | 1,441,048 |  |  |  |  |
Audit Committee Chairman |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation value of transaction |  |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment (in shares) |  |  |  |  |  |  |  |  |  |  |  | 36,937 | 18,996 | 31,286 |
Independent directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation value of transaction |  | $ 7,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment (in shares) |  |  |  |  |  |  |  |  |  |  |  | 36,937 | 18,996 | 31,286 |
2016 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares (in shares) |  |  |  |  |  |  |  |  | 113,076 |  |  |  | 113,076 | 0 |
2016 Share Repurchase Program | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000
2018 Share Repurchase Program | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  | 3,000,000 |  |
Share repurchased (in shares) |  |  |  |  |  |  |  | 1,332,182 | 345,012 |  |  |  |  |  |
Repurchased shares canceled (in shares) |  |  |  |  |  |  | 1,677,194 |  |  |  |  |  |  |  |
2019 June Share Repurchase Program | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased (in shares) |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |
Share repurchased (in shares) |  |  |  |  |  | 1,361 |  |  |  |  |  |  |  |  |
2019 October Share Repurchase Program | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased (in shares) |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |
Share repurchased (in shares) |  |  |  |  | 1,000,935 |  |  |  |  |  |  |  |  |  |
2019 December Share Repurchase Program | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased (in shares) | 1,500,000 |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |
Share repurchased (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hull No. S 1772 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Installment payment |  |  |  | $ 6,600,000 |  |  |  |  |  | $ 3,300,000 |  |  |  |  |
Subsequent Event | 2019 December Share Repurchase Program | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchased (in shares) |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |

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