RESTRUCUTRING CHARGES (Cost Incurred and Expected to be Incurred) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	$ 4,492
Restructuring charges	3,558	$ 0	$ 0
Cumulative Costs Incurred to Date	3,558
Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	3,613
Restructuring charges	3,300
Cumulative Costs Incurred to Date	3,300
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	605
Restructuring charges	0
Cumulative Costs Incurred to Date	0
Other related costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	274
Restructuring charges	258
Cumulative Costs Incurred to Date	258
Operating segment | MMS
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	255
Restructuring charges	255
Cumulative Costs Incurred to Date	255
Operating segment | MMS | Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	255
Restructuring charges	255
Cumulative Costs Incurred to Date	255
Operating segment | MMS | Other related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Operating segment | ATA
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	4,237
Restructuring charges	3,303
Cumulative Costs Incurred to Date	3,303
Operating segment | ATA | Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	3,358
Restructuring charges	3,045
Cumulative Costs Incurred to Date	3,045
Operating segment | ATA | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	605
Restructuring charges	0
Cumulative Costs Incurred to Date	0
Operating segment | ATA | Other related costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	274
Restructuring charges	258
Cumulative Costs Incurred to Date	$ 258