SHARE-BASED COMPENSATION PLANS Share-based compensation expense and income tax benefits recognized during the periods (Details) - USD ($) $ in Thousands |
3 Months Ended | |
---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Share-based compensation expense | $ 5,341 | $ 4,955 |
Income tax benefit | (1,161) | (1,734) |
Share-based compensation expense, net of tax | 4,180 | 3,221 |
Stock option and stock purchase plans | ||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Share-based compensation expense | 1,875 | 1,905 |
Unvested stock | ||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Share-based compensation expense | $ 3,466 | $ 3,050 |