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CAPITAL STOCK (Details) - shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Common Stock [Roll Forward] |  |  |
Balance, beginning of period (in shares) | 17,197,380 |  |
Balance, end of period (in shares) | 17,315,573 | 17,197,380 |
Treasury Shares [Roll Forward] |  |  |
Issuance of treasury shares for acquisition (in shares) |  |  | 148,769
Purchase of treasury shares (in shares) |  |  | 191,420
Issuance of treasury shares upon vesting of restricted shares net of withholding (in shares) |  | 264,297 | 57,401
Common Stock [Member] |  |  |
Common Stock [Roll Forward] |  |  |
Balance, beginning of period (in shares) | 17,197,000 | 14,390,000 | 14,375,000
Issuance of shares for compensation net of withholding (in shares) | 119,000 | 84,000 | 15,000
Issuance of common stock related to equity distribution agreements (in shares) | 0 | 2,723,000 | 0
Balance, end of period (in shares) | 17,316,000 | 17,197,000 | 14,390,000
Treasury Stock [Member] |  |  |
Treasury Shares [Roll Forward] |  |  |
Balance, beginning of period (in shares) | 0 | 264,000 | 280,000
Issuance of treasury shares for acquisition (in shares) | 0 | 0 | (149,000)
Purchase of treasury shares (in shares) | 0 | 0 | 191,000
Issuance of treasury shares upon vesting of restricted shares net of withholding (in shares) | 0 | (264,000) | (58,000)
Balance, end of period (in shares) | 0 | 0 | 264,000
Series A Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, outstanding (in shares) | 1,122 | 1,122 |
Series B Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, outstanding (in shares) | 15,000 | 15,000 |

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