RESTRUCTURING CHARGES (Restructuring Reserve) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Reserve [Roll Forward]
Balance at December 31, 2015	$ 1,409
Restructuring	200	$ 0
Cash expenditures	(836)
Foreign currency translation adjustment	43
Balance at March 31, 2016	816
Employee termination costs
Restructuring Reserve [Roll Forward]
Restructuring	200
Other related costs
Restructuring Reserve [Roll Forward]
Restructuring	0
Operating segment | MMS
Restructuring Reserve [Roll Forward]
Balance at December 31, 2015	167
Restructuring	0
Cash expenditures	(5)
Foreign currency translation adjustment	0
Balance at March 31, 2016	162
Operating segment | MMS | Employee termination costs
Restructuring Reserve [Roll Forward]
Restructuring	0
Operating segment | ATA
Restructuring Reserve [Roll Forward]
Balance at December 31, 2015	1,242
Restructuring	200
Cash expenditures	(831)
Foreign currency translation adjustment	43
Balance at March 31, 2016	654
Operating segment | ATA | Employee termination costs
Restructuring Reserve [Roll Forward]
Restructuring	200
Operating segment | ATA | Other related costs
Restructuring Reserve [Roll Forward]
Restructuring	$ 0