RESTRUCTURING CHARGES (Cost Incurred and Expected to be Incurred) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	$ 4,325		$ 4,325
Restructuring	226	$ 0	426	$ 0
Cumulative Costs Incurred to Date	3,984		3,984
Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	3,583		3,583
Restructuring	69		269
Cumulative Costs Incurred to Date	3,569		3,569
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	203		203
Restructuring	0		0
Cumulative Costs Incurred to Date	0		0
Other related costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	539		539
Restructuring	157		157
Cumulative Costs Incurred to Date	415		415
Operating segment | MMS
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	260		260
Restructuring	0		0
Cumulative Costs Incurred to Date	255		255
Operating segment | MMS | Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	260		260
Restructuring	0		0
Cumulative Costs Incurred to Date	255		255
Operating segment | MMS | Other related costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	0		0
Restructuring	0		0
Cumulative Costs Incurred to Date	0		0
Operating segment | ATA
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	4,065		4,065
Restructuring	226		426
Cumulative Costs Incurred to Date	3,729		3,729
Operating segment | ATA | Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	3,323		3,323
Restructuring	69		269
Cumulative Costs Incurred to Date	3,314		3,314
Operating segment | ATA | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	203		203
Restructuring	0		0
Cumulative Costs Incurred to Date	0		0
Operating segment | ATA | Other related costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	539		539
Restructuring	157		157
Cumulative Costs Incurred to Date	$ 415		$ 415