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SHARE-BASED AWARDS AND OPTIONS - Narrative (Details) $ / shares in Units, $ in Thousands | 7 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares | May 31, 2016 USD ($) $ / shares | May 31, 2015 | May 31, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense | $ 18,707 | $ 57,826 | $ 39,095 | $ 30,809 |  |
Total unrecognized compensation cost of stock options |  | $ 3,300 |  |  |  |
Restricted Stock and Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |
Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 28 months |  |  |  |
Leveraged Performance Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award performance period |  | 3 years |  |  | 3 years |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total fair value of share awards vested in period | 20,000 | $ 43,400 | 33,700 | 17,400 |  |
Share-based compensation expense | 17,200 | 53,200 | 35,200 | 28,800 |  |
Total unrecognized compensation cost of restricted stock and performance awards |  | $ 62,700 |  |  |  |
Weighted average period of unrecognized compensation cost |  | 2 years |  |  |  |
Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense | $ 1,100 | $ 2,700 | $ 2,600 | $ 1,400 |  |
Weighted average period of unrecognized compensation cost |  | 1 year 9 months |  |  |  |
Fair market value (as a percent) |  | 100.00% |  |  |  |
Stock option term |  | 10 years |  |  |  |
Stock Option Plan 2011 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock reserved for future issuance (shares) | shares |  |  |  |  |  | 14,000,000
Weighted average grant date fair value (USD per share) | $ / shares | $ 21.87 | $ 35.09 | $ 23.68 | $ 15.60 |  |
Granted Fiscal 2015 | Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |
Year One | Leveraged Performance Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting rate of performance units (as a percent) |  | 33.33% |  |  |  |
Year Two | Leveraged Performance Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting rate of performance units (as a percent) |  | 33.33% |  |  |  |
Year Three | Leveraged Performance Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting rate of performance units (as a percent) |  | 33.33% |  |  |  |
Maximum | Leveraged Performance Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payout ratio of awards |  | 4 |  |  |  |
Minimum | Leveraged Performance Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payout ratio of awards |  | 0 |  |  |  |

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