GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Summary of goodwill amount
Balance at December 31, 2016	$ 6,579
Goodwill	39,013	$ 39,013
Accumulated impairment losses	(32,434)	(32,434)
Currency translation adjustments	73
Balance at March 31, 2017	6,652
MMS
Summary of goodwill amount
Balance at December 31, 2016	0
Goodwill	32,434	32,434
Accumulated impairment losses	(32,434)	(32,434)
Currency translation adjustments	0
Balance at March 31, 2017	0
ATA
Summary of goodwill amount
Balance at December 31, 2016	6,579
Goodwill	6,579	6,579
Accumulated impairment losses	0	$ 0
Currency translation adjustments	73
Balance at March 31, 2017	$ 6,652