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NET INCOME PER SHARE - Narrative (Details) - shares | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 15, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Shares excluded from computation as their effect would be anti-dilutive (in shares) | 200,000 | 300,000 |  |
Vested Restricted Units and Vested Performance Units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Weighted average number of shares outstanding, basic and diluted (in shares) | 500,000 |  |  |
Convertible Debt |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Warrants exercised (in shares) |  |  | 8,707,202 |
Common stock from the exercise of warrants (in shares) |  |  | 2,839,743 |
Warrants outstanding (in shares) | 0 |  |  |
2016 Senior Convertible Notes | Convertible Debt |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Interest rate on debt |  |  |  | 1.625%

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