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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unrecognized costs |  |  |
Unrecognized costs related to all share-based awards outstanding | $ 9.7 |  |
Weighted average period for recognition of unrecognized compensation costs | 2 years 3 months 18 days |  |
Stock options |  |  |
Nonvested Stock Option Shares |  |  |
Nonvested at the beginning of the period (in shares) | 1,266,312 |  |
Granted (in shares) | 352,617 |  |
Vested (in shares) | (359,278) |  |
Forfeited (in shares) | (30,000) |  |
Nonvested at the end of the period (in shares) | 1,229,651 | 1,266,312 |
Weighted-Average Grant Date Fair Value |  |  |
Nonvested at the beginning of the period (in dollars per share) | $ 10.83 |  |
Granted (in dollars per share) | 12.19 | $ 13.52 | $ 11.92
Vested (in dollars per share) | 6.70 |  |
Forfeited (in dollars per share) | 10.75 |  |
Nonvested at the end of the period (in dollars per share) | $ 12.37 | $ 10.83 |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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