INTANGIBLE ASSETS - Summary of carrying amount of goodwill (Details 3) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Goodwill [Roll Forward] | |||||
| Beginning year | $ 43,424 | ||||
| Impairment | $ (7,800) | $ (1,400) | $ (1,300) | (12,005) | $ (2,712) |
| Ending year | 43,424 | 33,554 | 43,424 | ||
| Goodwill | |||||
| Goodwill [Roll Forward] | |||||
| Beginning year | 43,424 | 44,348 | |||
| Impairment | (9,870) | (924) | |||
| Ending year | 43,424 | 33,554 | 43,424 | ||
| Trade names | |||||
| Goodwill [Roll Forward] | |||||
| Beginning year | 2,972 | 3,632 | |||
| Impairment | (2,054) | (660) | |||
| Ending year | $ 2,972 | $ 918 | $ 2,972 | ||