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STOCK-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 $ / shares | Jun. 30, 2019 USD ($) plan $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation arrangement by share-based payment award, number of plans | plan |  | 2
Grants in period, net of forfeitures (in shares) | shares |  | 202,752
Options, weighted average grant date fair value (in dollars per share) | $ / shares | $ 18.74 |
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total unrecognized compensation costs | $ |  | $ 6.2
Weighted-average period for cost recognition |  | 3 years
Stock options | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options exercisable, vesting period |  | 4 years
Stock options | Directors |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options exercisable, vesting period |  | 1 year
Stock options | Employees |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period |  | 8 years
Stock options | Directors and Certain Executive Officers | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period |  | 6 years
Stock options | Directors and Certain Executive Officers | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period |  | 10 years
Restricted stock awards/stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options exercisable, vesting period |  | 3 years
Total unrecognized compensation costs | $ |  | $ 29.8
Weighted-average period for cost recognition |  | 2 years
Awards granted during the period (in shares) | shares |  | 254,268
Other than options, weighted average grant date fair value (in dollars per share) | $ / shares |  | $ 54.72
Performance stock and Restricted stock awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Requisite service periods of awards |  | 3 years
Performance shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted during the period (in shares) | shares |  | 118,903
Other than options, weighted average grant date fair value (in dollars per share) | $ / shares |  | $ 55.91

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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