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EQUITY PLANS - Additional Information (Details) | 1 Months Ended | 5 Months Ended | 12 Months Ended |  |
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Jan. 31, 2021 USD ($) | Jan. 31, 2020 USD ($) shares | Jan. 31, 2019 shares | Nov. 30, 2015 shares | Dec. 31, 2020 USD ($) plan $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 $ / shares shares | Dec. 09, 2015 shares | Jun. 14, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of incentive plans | plan |  |  |  |  | 2 |  |  |  |  |
Share based compensation expense | $ |  |  |  |  | $ 17,700,000 | $ 3,800,000 | $ (1,500,000) |  |  |
Share-based income tax benefit (expense) | $ |  |  |  |  | 6,900,000 | 900,000 | (400,000) |  |  |
Unrecognized share-based compensation expense | $ |  |  |  |  | $ 15,300,000 |  |  |  |  |
Period for recognition |  |  |  |  | 1 year 4 months 24 days |  |  |  |  |
Intrinsic value of options exercised or unvested Put to the company and canceled | $ |  |  |  |  | $ 400,000 | 0 | 40,500,000 |  |  |
Compensation cost | $ |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
Number of common shares repurchased (in shares) |  |  |  |  | 1,812,393 | 9,079,690 |  |  |  |
Average cost per share, including commissions (in dollar per share) | $ / shares |  |  |  |  | $ 18.37 | $ 24.57 | $ 23.50 |  |  |
Valuation, income approach |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value measurement of common stock |  |  |  |  | 0.50 |  |  |  |  |
Valuation, market approach |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value measurement of common stock |  |  |  |  | 0.50 |  |  |  |  |
RSUs and PSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair values (in dollars per share) | $ / shares |  |  |  |  | $ 31.27 | $ 30.68 | $ 27.15 |  |  |
Restricted stock units (RSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Total intrinsic value of RSUs | $ |  |  |  |  | $ 23,700,000 | $ 5,400,000 | $ 600,000 |  |  |
Performance Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 53,617 |  |  |  |  |
Granted (in shares) |  |  |  |  | 48,209 |  |  |  |  |
Financed options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  | 1,864,428 |  |  |  |  |  |
Number of common shares repurchased (in shares) |  |  |  |  |  |  | 331,112 |  |  |
Notes related to financed options (in shares) |  |  |  |  |  |  | 1,439,984 |  |  |
Put options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  |  | 0 |  | 54,976 |  |
Vested but unexercised options (in shares) |  |  |  |  |  |  |  | 13,336 |  |
Vested but unexercised options (in usd per share) | $ / shares |  |  |  |  |  |  |  | $ 24.38 |  |
Vested but unexercised options (in shares) |  |  |  |  |  |  | 0 |  |  |
Intrinsic value of outstanding stock options | $ |  |  |  |  |  |  | $ 2,900,000 |  |  |
Reduction to compensation expense | $ |  |  |  |  |  |  | $ 3,200,000 |  |  |
Liability classified restricted stock units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vested but unexercised options (in shares) |  | 9,572 | 9,568 |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 9,572 |  |  |  |  |
Settlement price of vested RSUs | $ |  | $ 200,000 |  |  |  |  |  |  |  |
Liability classified restricted stock units | Subsequent event |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement price of vested RSUs | $ | $ 500,000 |  |  |  |  |  |  |  |  |
Other stock based award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share based compensation expense | $ |  |  |  |  | $ 6,300,000 |  |  |  |  |
Granted (in shares) |  |  |  |  | 131,046 |  |  |  |  |
2010 Option plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  | 19,564 |  |  |  |  |
Intrinsic value of outstanding stock options | $ |  |  |  |  | $ 4,100,000 |  |  |  |  |
2010 Option plan | Stock option |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock available to acquire (in shares) |  |  |  |  |  |  |  |  |  | 2,455,368
2015 Incentive plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock available to acquire (in shares) |  |  |  |  |  |  |  |  | 1,700,000 |
Shares available for grant (in shares) |  |  |  |  | 576,076 |  |  |  |  |
2015 Incentive plan | Restricted stock units (RSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |  |
Vesting percentage per year |  |  |  |  | 33.00% |  |  |  |  |
2015 Incentive plan | Performance Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 31,478 | 48,525 | 0 |  |  |

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