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SHAREHOLDERS' EQUITY - Narrative (Details) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 29, 2016 Installment shares | Jul. 31, 2015 Installment shares | Nov. 30, 2011 Installment shares | Aug. 31, 2010 Installment shares | Nov. 30, 2017 Installment shares | Mar. 31, 2012 Installment shares | Dec. 31, 2017 USD ($) plan director shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Oct. 31, 2017 Installment shares | Dec. 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of compensation plans | plan |  |  |  |  |  |  | 3 |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  | $ 1.6 | $ 1.7 | $ 0.9 |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised | $ |  |  |  |  |  |  | $ 1.3 | $ 0.0 | $ 0.0 |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 1,001,300 | 1,410,250 | 954,625 |  | 1,127,250
Share based compensation cost | $ |  |  |  |  |  |  | $ 1.1 | $ 0.8 | $ 0.2 |  |
Share based compensation cost, future income tax benefits | $ |  |  |  |  |  |  | 0.2 | 0.3 | 0.1 |  |
Unrecognized compensation costs, unvested stock options | $ |  |  |  |  |  |  | $ 1.0 |  |  |  |
Weighted average period of recognition |  |  |  |  |  |  | 2 years 5 months 19 days |  |  |  |
Total fair value of stock options vested | $ |  |  |  |  |  |  | $ 0.9 | 0.6 | 1.1 |  |
Employee Stock Option | ETG |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  | 0.0 | 0.1 | 0.0 |  |
Restricted Stock Units (RSUs) | Key Employee | Granted November 2011 | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  | 0.1 | 0.1 | 0.2 |  |
Restricted Stock Units (RSUs) | Key Employee | Grant February 2016 | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  | 0.2 | 0.5 |  |  |
Restricted Stock Units (RSUs) | Two Key Employees | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  | 0.1 | 0.1 | 0.4 |  |
Restricted Stock Units (RSUs) | Director | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  | $ (0.1) | 0.1 | 0.1 |  |
1999 Long-term Stock Incentive Plan, as amended |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance (in shares) |  |  |  |  |  |  | 7,500,000 |  |  |  |
Number of shares granted per calendar year in total, maximum (in shares) |  |  |  |  |  |  | 3,000,000 |  |  |  |
1999 Long-term Stock Incentive Plan, as amended | Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares granted per calendar year in total, maximum (in shares) |  |  |  |  |  |  | 1,500,000 |  |  |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 158,375 |  |  |  |
2006 Stock Incentive Plan For Non-Employee Directors |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance (in shares) |  |  |  |  |  |  | 200,000 |  |  |  |
2006 Stock Incentive Plan For Non-Employee Directors | Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 5,000 |  |  |  |
2010 Long-term Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance (in shares) |  |  |  |  |  |  | 7,500,000 |  |  |  |
2010 Long-term Stock Incentive Plan | Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares granted per calendar year in total, maximum (in shares) |  |  |  |  |  |  | 1,500,000 |  |  |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 837,925 |  |  |  |
2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock outstanding (in shares) |  |  |  |  |  |  | 191,267 |  |  |  |
2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) | Key Employee |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of directors that resigned during period | director |  |  |  |  |  |  | 2,000,000 |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  | $ 0.1 |  | 0.1 |  |
Restricted Stock and Restricted Stock Units [Abstract] |  |  |  |  |  |  |  |  |  |  |
RSU's granted (in shares) | 100,000 | 23,620 | 100,000 |  | 53,288 |  |  |  |  |  |
Number of vesting installments | Installment | 3 | 4 | 10 |  | 3 |  |  |  |  | 2 |
Number of units vesting immediately |  |  |  |  |  |  |  |  |  | 1,844 |
Number of units vesting annually (in shares) |  | 5,905 | 10,000 |  | 49,600 |  |  |  |  |  |
2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) | Key Employee | Granted August 2010 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock and Restricted Stock Units [Abstract] |  |  |  |  |  |  |  |  |  |  |
RSU's granted (in shares) |  |  |  | 175,000 |  |  |  |  |  |  |
Number of vesting installments | Installment |  |  |  | 10 |  |  |  |  |  |  |
Number of units vesting annually (in shares) |  |  |  | 17,500 |  |  |  |  |  |  |
2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) | Key Employee | Granted August 2010 | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  | $ 0.1 | $ 0.1 | $ 0.2 |  |
2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) | Two Key Employees |  |  |  |  |  |  |  |  |  |  |
Restricted Stock and Restricted Stock Units [Abstract] |  |  |  |  |  |  |  |  |  |  |
RSU's granted (in shares) |  |  |  |  |  | 50,000 |  |  |  |  |
Number of vesting installments | Installment |  |  |  |  |  | 10 |  |  |  |  |
Number of units vesting annually (in shares) |  |  |  |  |  | 10,000 |  |  |  |  |
RSU's vested (in shares) |  |  |  |  |  | 35,000 |  |  |  |  |

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