STOCK BASED COMPENSATION - Summary of Stock Option Valuation Assumptions (Details) - Stock Option Plan |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Risk-free interest rate | 1.76% | 1.99% | 2.70% |
| Expected term | 10 years | 10 years | 10 years |
| Expected stock price volatility | 34.60% | 18.06% | 17.72% |
| Dividend yield | 0.00% | 0.00% | 0.00% |