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CAPITAL STOCK (Tables) | 12 Months Ended
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Dec. 31, 2017
CAPITAL STOCK [Abstract] |
Activity of Outstanding Common Stock |
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Common Stock: |  | Quantity (in thousands) |
Balance, beginning of period |  |  | 17,197 |  |  |  | 14,390 |  |  |  | 14,375 |
Issuance of shares for compensation net of withholding |  |  | 119 |  |  |  | 84 |  |  |  | 15 |
Issuance of common stock related to equity distribution agreements |  |  | - |  |  |  | 2,723 |  |  |  | - |
Balance, end of period |  |  | 17,316 |  |  |  | 17,197 |  |  |  | 14,390 |
Activity of Common Stock Held in Treasury |
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Treasury Shares: |  | Quantity (in thousands) |
Balance, beginning of period |  |  | - |  |  |  | 264 |  |  |  | 280 |
Issuance of treasury shares for acquisition |  |  | - |  |  |  | - |  |  |  | (149 | )
Purchase of treasury shares |  |  | - |  |  |  | - |  |  |  | 191 |
Issuance of treasury shares upon vesting of restricted shares net of withholding |  |  | - |  |  |  | (264 | ) |  |  | (58 | )
Balance, end of period |  |  | - |  |  |  | - |  |  |  | 264 |

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- Definition Tabular disclosure of the change in common stock held in treasury. + References No definition available. + Details
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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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