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SHARE-BASED AWARDS AND OPTIONS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 148,792 | $ 89,634 | $ 57,826 |
Restricted Stock Awards and Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total fair value of share awards vested in period | 107,700 | 82,100 | 43,400 |
Share-based compensation expense | 135,400 | 74,300 | 53,200 |
Total unrecognized compensation cost of restricted stock and performance awards | $ 179,500 |  |  |
Weighted average period of unrecognized compensation cost | 2 years |  |  |
Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award requisite service period | 3 years |  |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 8,400 | 12,500 | 2,700 |
Weighted average period of unrecognized compensation cost | 1 year 8 months 12 days |  |  |
Fair market value (as a percent) | 100.00% |  |  |
Stock option term | 10 years |  |  |
Aggregate value of stock options exercised | $ 85,800 | $ 28,800 | $ 16,500 |
Total unrecognized compensation cost of stock options | $ 8,400 |  |  |
Stock Option Plan 2011 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock reserved for future issuance (shares) |  |  |  | 14,000,000.0
Stock Option Plan 2011 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average grant date fair value (USD per share) | $ 54.85 | $ 99.56 | $ 35.09 |
Granted Fiscal 2015 | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 3 years |  |  |
Minimum | Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award requisite service period | 1 year |  |  |
Maximum | Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award requisite service period | 3 years |  |  |

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