RESTRUCTURING CHARGES (Cost Incurred and Expected to be Incurred) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	$ 4,492
Restructuring	200	$ 0
Cumulative Costs Incurred to Date	3,758
Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	3,613
Restructuring	200
Cumulative Costs Incurred to Date	3,500
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	605
Restructuring	0
Cumulative Costs Incurred to Date	0
Other related costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	274
Restructuring	0
Cumulative Costs Incurred to Date	258
Operating segment | MMS
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	255
Restructuring	0
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	0
Cumulative Costs Incurred to Date	255
Operating segment | ATA
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	4,237
Restructuring	200
Cumulative Costs Incurred to Date	3,503
Operating segment | ATA | Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	3,358
Restructuring	200
Cumulative Costs Incurred to Date	3,245
Operating segment | ATA | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	605
Restructuring	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	0
Cumulative Costs Incurred to Date	$ 258