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STOCK-BASED COMPENSATION PLANS - Executive Equity Arrangements (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 15, 2019 shares | Mar. 31, 2017 executive shares | Apr. 30, 2019 shares | Feb. 28, 2019 executive shares | May 31, 2018 shares | Mar. 31, 2018 executive shares | Apr. 30, 2019 shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) participant | Dec. 31, 2017 USD ($) | Mar. 08, 2019 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 4.97
Stock-based compensation | $ |  |  |  |  |  |  |  | $ 12,601 | $ 11,072 | $ 25,657 |
Vested (in shares) |  |  | 292,500 |  |  |  |  |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 872,073 |  |  |  |
PSAs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 195,000 |  |  | 872,073 |  |  |
Stock-based compensation | $ |  |  |  |  |  |  |  |  | $ 300 |  |
Percent of performance metrics achieved |  |  |  |  | 150.00% |  |  |  |  |  |
Percent of performance metrics achieved, level one |  |  |  | 106.49% |  |  |  |  |  |  |
Percent of performance metrics achieved, level two |  |  |  | 150.00% |  |  |  |  |  |  |
Vested (in shares) |  |  |  | 250,075 |  |  |  | 9,466 |  |  |
Stock Bonus Election Program | 2018 Bonus Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Uplift percentage |  |  |  |  |  |  |  |  | 20.00% |  |
Stock Bonus Election Program | Share-based Payment Arrangement |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Participants | participant |  |  |  |  |  |  |  |  | 23 |  |
Granted (in shares) | 198,949 |  |  |  |  |  |  |  |  |  |
Stock Bonus Election Program | Uplift Shares and 2018 Bonus Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | $ |  |  |  |  |  |  |  |  | $ 1,100 |  |
Performance PSUs | Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 523,244 |  |  |  |
Percent of performance metrics achieved |  |  |  |  |  |  |  | 200.00% |  |  |
Market PSUs | Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 348,829 |  |  |  |
Percent of performance metrics achieved |  |  |  |  |  |  |  | 200.00% |  |  |
2017 Performance Share Units | PSAs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 165,000 |  |  |  |  |  |  |  |  |
Percent of performance metrics achieved |  |  |  | 61.40% |  | 130.00% |  |  |  |  |
Vested (in shares) |  |  |  | 9,464 |  | 33,584 |  |  |  |  |
Executive granted shares | executive |  | 5 |  |  |  |  |  |  |  |  |
Number of remaining executives holding grants | executive |  |  |  | 3 |  | 3 |  |  |  |  |
March 31, 2017 | 2017 Performance Share Units | PSAs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of performance metrics achieved |  |  |  |  |  | 100.00% |  |  |  |  |
Vested (in shares) |  |  |  |  |  | 25,834 |  |  |  |  |
March 31, 2018 | 2017 Performance Share Units | PSAs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  | 7,750 |  |  |  |  |
Percent achievement over target |  |  |  |  |  | 30.00% |  |  |  |  |
Minimum | Stock Bonus Election Program | 2018 Bonus Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of bonus available for program |  |  |  |  |  |  |  |  | 10.00% |  |
Maximum | Stock Bonus Election Program | 2018 Bonus Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of bonus available for program |  |  |  |  |  |  |  |  | 50.00% |  |
Executive Officer | 2018 Performance Share Units | Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of performance metrics achieved |  |  | 150.00% |  |  |  |  |  |  |  |
Executive Officer | March 16, 2018 | 2018 Performance Share Units | Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  |  |  | 5,950 |  |  |  |  |  |  |

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