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SHARE CAPITAL AND SHARE OPTIONS - Share Capital (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Nov. 30, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017
Share capital: |  |  |  |  |
Common stock, value, authorized |  | $ 150,000 | $ 150,000 |  | $ 150,000
Common stock, value, issued |  | $ 101,303 | 101,119 |  | 101,119
Shares issued upon exercise of share options (in shares) |  | 184,000 |  |  |
Contributed surplus |  | $ 200,000 | $ 200,000 |  | $ 200,000
Common stock, shares authorized (in shares) |  | 150,000,000 | 150,000,000 |  | 150,000,000
Common shares, par value (in dollars per share) |  | $ 1.00 | $ 1.00 |  | $ 1.00
Common shares, shares issued (in shares) |  | 101,302,404 | 101,118,289 |  | 101,118,289
Common shares, shares outstanding (in shares) |  | 101,302,404 | 101,118,289 |  | 101,118,289
Percent of stock outstanding | 5.00% |  |  |  |
Repurchase period | 2 years |  |  |  |
Remaining amount in share repurchase program (in shares) |  |  |  |  | 500,000
Purchase of treasury shares |  | $ 0 | $ 0 | $ 8,214 | $ 20,500
Common Stock |  |  |  |  |
Share capital: |  |  |  |  |
Shares issued upon exercise of share options (in shares) |  | 184,115 | 38,000.000 |  |
Equity Swap |  |  |  |  |
Share capital: |  |  |  |  |
Shares acquired by counterparty (in shares) |  | 3,000,000 |  |  |
Shares acquired by counterparty, per share price (in dollars per share) |  | $ 45.01 |  |  | $ 45.01

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