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STOCK-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions | 9 Months Ended
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Sep. 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 | $ | $ 5.3
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 | $ | $ 28.1
Weighted-average period for cost recognition | 2 years
Awards granted during the period (in shares) | shares | 318,410
Other than options, weighted average grant date fair value (in dollars per share) | $ / shares | $ 55.19
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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