EQUITY-BASED COMPENSATION - Summary of assumptions to estimate the grant date fair value of stock options and SARs (Details) - Stock Option And Stock Appreciation Rights |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Volatility | 42.40% | 43.00% | 57.80% |
| Expected term (in years) | 5 years 4 months 24 days | 5 years 6 months | 6 years 2 months 12 days |
| Risk-free rate | 1.40% | 1.65% | 1.88% |
| Dividend yield | 0.00% | 0.00% | 0.00% |