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SHARE-BASED COMPENSATION (Details) - Time-based and performance-based shares - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based compensation |  |  |  |
Shares granted | 21,000 |  | 359,000 |
Weighted-average grant date fair value (in dollars per share) | $ 38.36 |  | $ 33.59 |
Total unrecognized compensation cost | $ 18.8 |  | $ 18.8 |
Unrecognized compensation cost over weighted-average period to be recognized |  |  | 2 years |
Selling, general and administrative expenses |  |  |  |
Share-based compensation |  |  |  |
Total stock-based compensation cost | $ 3.0 | $ 2.8 | $ 6.2 | $ 5.5

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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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