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SHARE-BASED AWARDS - SUMMARY (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) plan $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($)
Share-based expense (net of estimated forfeitures) |  |  |
Total share-based expense | $ 18,800 | $ 11,300 | $ 12,100
Intrinsic value of options exercised | 5,800 | 500 | 500
Tax benefit realized upon option exercise | 3,300 | 2,000 | 2,700
Fair value of stock vested | 13,100 | $ 8,200 | $ 10,800
Stock options |  |  |
Share-based expense (net of estimated forfeitures) |  |  |
Unrecognized compensation cost | $ 0 |  |
Weighted average exercise price |  |  |
Outstanding, weighted average exercise price, beginning of period (in dollars per share) | $ / shares | $ 22.30 |  |
Exercised, weighted average exercise price (in dollars per share) | $ / shares | 22.31 |  |
Outstanding, weighted average exercise price, end of period (in dollars per share) | $ / shares | 20.84 | $ 22.30 |
Exercisable, weighted average exercise price, end of period (in dollars per share) | $ / shares | $ 20.84 |  |
Outstanding, weighted average contractual life, end of period | 1 month 6 days |  |
Exercisable, weighted average contractual life, end of period | 1 month 6 days |  |
Outstanding, aggregate intrinsic value, end of period (in dollars) | $ 35 |  |
Exercisable, aggregate intrinsic value, end of period (in dollars) | 35 |  |
Non-vested restricted stock units and performance-based equity awards |  |  |
Share-based expense (net of estimated forfeitures) |  |  |
Unrecognized compensation cost | $ 17,700 |  |
Unrecognized compensation cost, weighted average period for recognition | 1 year 8 months 12 days |  |
Restricted Stock Units |  |  |
Share-based compensation |  |  |
Options granted, weighted average grant-date fair value (in dollars per share) | $ / shares | $ 38.68 |  |
2016 Plan |  |  |
Share-based compensation |  |  |
Common stock initially available for future issuance (in shares) | shares | 2,500 |  |
Additional shares authorized for issuance | shares | 0 |  |
Number of separate incentive compensation programs | plan | 4 |  |
Number of share based compensation plans within the entity's incentive compensation programs | plan | 3 |  |
2016 Plan | Discretionary Grant Program |  |  |
Share-based compensation |  |  |
Minimum exercise price as a percentage of fair market value of common stock | 100.00% |  |
Exercisable period | 3 years |  |
Expiration Term | 10 years |  |
2016 Plan | Time-Based Restricted Stock Units | Stock Issuance Program |  |  |
Share-based compensation |  |  |
Vesting period of awards granted | 3 years |  |
2016 Plan | Time-Based Restricted Stock Units | Automatic Grant Program |  |  |
Share-based compensation |  |  |
Vesting period of awards granted | 1 year |  |
2016 Plan | Performance-Based Restricted Stock Units | Stock Issuance Program |  |  |
Share-based compensation |  |  |
Vesting period of awards granted | 3 years |  |
2007 Plan | Stock options |  |  |
Activity in the entity's stock option plans |  |  |
Outstanding, beginning of period (in shares) | shares | 173 |  |
Exercised (in shares) | shares | (172) |  |
Outstanding, end of period (in shares) | shares | 1 | 173 |
Exercisable, end of period (in shares) | shares | 1 |  |

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