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STOCK-BASED COMPENSATION - Status of Nonvested Shares and Unrecognized Costs (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unrecognized costs |  |  |
Unrecognized costs related to all share-based awards outstanding | $ 6.9 |  |
Weighted average period for recognition of unrecognized compensation costs | 2 years 7 months 6 days |  |
Stock options |  |  |
Nonvested Shares |  |  |
Nonvested at the beginning of the period (in shares) | 1,167,998 |  |
Granted (in shares) | 411,956 |  |
Vested (in shares) | (343,651) |  |
Forfeited (in shares) | (33,336) |  |
Nonvested at the end of the period (in shares) | 1,202,967 | 1,167,998 |
Weighted-Average Grant Date Fair Value |  |  |
Nonvested at the beginning of the period (in dollars per share) | $ 5.39 |  |
Granted (in dollars per share) | 11.92 | $ 6.67 | $ 5.90
Vested (in dollars per share) | 3.84 |  |
Forfeited (in dollars per share) | 6.44 |  |
Nonvested at the end of the period (in dollars per share) | $ 8.07 | $ 5.39 |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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