RESTRUCUTRING CHARGES (Cost Incurred and Expected to be Incurred) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	$ 4,340		$ 4,340
Restructuring charges	877	$ 0	877	$ 0
Cumulative Costs Incurred to Date	877		877
Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	2,961		2,961
Restructuring charges	792		792
Cumulative Costs Incurred to Date	792		792
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	605		605
Restructuring charges	0		0
Cumulative Costs Incurred to Date	0		0
Other related costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	774		774
Restructuring charges	85		85
Cumulative Costs Incurred to Date	85		85
Operating segment | MMS
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	243		243
Restructuring charges	243		243
Cumulative Costs Incurred to Date	243		243
Operating segment | MMS | Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	243		243
Restructuring charges	243		243
Cumulative Costs Incurred to Date	243		243
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	4,097		4,097
Restructuring charges	634		634
Cumulative Costs Incurred to Date	634		634
Operating segment | ATA | Employee termination costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	2,718		2,718
Restructuring charges	549		549
Cumulative Costs Incurred to Date	549		549
Operating segment | ATA | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	605		605
Restructuring charges	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	774		774
Restructuring charges	85		85
Cumulative Costs Incurred to Date	$ 85		$ 85