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SUMMARY OF SIGNIFICANT EVENTS AND ACCOUNTING POLICIES - Restructuring and Redeemable Noncontrolling Interest (Details) |  | 1 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 16, 2014 USD ($) shares | Sep. 30, 2016 shares | Sep. 09, 2016 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Restructuring |  |  |  |  |
Severance Costs |  |  | $ 5,200,000 | $ 100,000 | $ 7,500,000
HK TMS | Preferred Stock |  |  |  |  |
Redeemable Noncontrolling Interest |  |  |  |  |
Proceeds received on sale of preferred shares | $ 150,000,000 |  |  |  |
Dividend rate (as a percent) | 8.00% |  |  |  |
Rate of return on preferred shares (as a percent) | 12.00% |  |  |  |
Multiple factor on investment | 1.25 |  |  |  |
Additional preferred shares issued for dividends paid-in-kind | shares |  | 791 | 9,329 |  |
HK TMS | Preferred Stock | Apollo |  |  |  |  |
Redeemable Noncontrolling Interest |  |  |  |  |
Initial Preferred Shares issued | shares | 150,000 |  |  |  |
HK TMS | Preferred Stock |  |  |  |  |
Redeemable Noncontrolling Interest |  |  |  |  |
Ownership percentage in subsidiaries | 100.00% |  |  |  |

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