GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Summary of goodwill amount
Goodwill	$ 39,054	$ 39,054
Accumulated impairment losses	(32,434)	(32,434)
Balance at December 31, 2015	6,620
Accumulated impairment losses	(8)
Balance at September 30, 2016	6,612
MMS
Summary of goodwill amount
Goodwill	32,434	32,434
Accumulated impairment losses	(32,434)	(32,434)
Balance at December 31, 2015	0
Accumulated impairment losses	0
Balance at September 30, 2016	0
ATA
Summary of goodwill amount
Goodwill	6,620	6,620
Accumulated impairment losses	0	$ 0
Balance at December 31, 2015	6,620
Accumulated impairment losses	(8)
Balance at September 30, 2016	$ 6,612