NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - The weighted average assumptions used in the model for valuing option grants (Details 1) - Stock Options - $ / shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Nature Of Business And Significant Accounting Policies [Line Items] | ||
| Dividend yield | 0.00% | 0.00% |
| Expected volatility | 25.00% | 25.00% |
| Risk-free interest rate | 1.52% | 1.68% |
| Expected average life | 7 years | 7 years |
| Weighted average per share fair value of options | $ 11.04 | $ 8.11 |