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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2016
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value of stock option awards is estimated on the date of grant using a binomial option-pricing model that uses the assumptions noted in the following table:
Valuation Assumptions |  | 2015 |  | 2014 |
Risk-free interest rate |  |  | 2.14 | % |  | 2.73 | %
Expected volatility |  |  | 72.5 | % |  | 72.0 | %
Expected dividend yield |  |  | 0.00 | % |  | 0.00 | %
Expected term |  |  | 5 yrs. |  |  | 5 yrs. |
Restricted Stock |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | A summary of all restricted stock activity during 2016 is as follows:
|  |  |  | Weighted |
|  |  |  | Average |
|  | Number of |  | Grant Date |
|  | Shares |  | Fair Value |
Restricted Stock Outstanding at December 31, 2015 |  |  | 1,538,116 |  | $ | 13.25 |
Granted |  |  | 1,105,010 |  | $ | 13.26 |
Vested |  |  | (618,145) |  | $ | 9.91 |
Forfeited |  |  | (61,256) |  | $ | 14.36 |
Restricted Stock Outstanding at December 31, 2016 |  |  | 1,963,725 |  | $ | 14.20 |
Stock Option |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of all stock option activity during 2016 is as follows:
|  |  |  |  |  | Weighted |  |  |  |
|  |  |  | Weighted |  | Average |  | Aggregate |
|  |  |  | Average |  | Remaining |  | Intrinsic |
|  | Number of |  | Exercise |  | Contractual |  | Value ($ in) |
|  | Options |  | Price |  | Life |  | millions) |
Options Outstanding at December 31, 2015 |  |  | 1,820,956 |  | $ | 11.61 |  |  | 5.2 |  | $ | 2.3 |
Exercised |  |  | (417,442) |  | $ | 11.57 |  |  |  |  | $ | 1.3 |
Forfeited |  |  | (17,300) |  | $ | 14.64 |  |  |  |  |  |  |
Expired |  |  | (112,460) |  | $ | 16.71 |  |  |  |  |  |  |
Options Outstanding at December 31, 2016 |  |  | 1,273,754 |  | $ | 11.13 |  |  | 5.1 |  | $ | 6.0 |
Options Exercisable at December 31, 2016 |  |  | 1,093,165 |  | $ | 10.67 |  |  | 4.6 |  | $ | 5.6 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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