EQUITY-BASED COMPENSATION - Summary of stock option and SAR activity (Details 1) - Stock Option And Stock Appreciation Rights - $ / shares shares in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Shares | |||
| Outstanding, January 1, 2016 | 1,529 | ||
| Granted | 966 | ||
| Exercised | (238) | (56) | (270) |
| Forfeited or expired | (608) | ||
| Outstanding, at December 31, 2016 | 1,649 | 1,529 | |
| Exercisable at December 31, 2016 | 453 | ||
| Weighted Average Exercise Price | |||
| Outstanding, January 1, 2015 | $ 8.69 | ||
| Granted | 7.11 | ||
| Exercised | 4.32 | ||
| Forfeited or expired | 9.77 | ||
| Outstanding, at December 31, 2016 | 7.97 | $ 8.69 | |
| Exercisable at December 31, 2016 | $ 9.04 | ||