RESTRUCTURING COSTS AND ACCRUALS (Details) $ in Thousands	3 Months Ended				6 Months Ended		17 Months Ended
	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2017 USD ($)
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year		$ 7,180			$ 7,180
New restructuring charges - operating expenses					3,176
Revisions of estimated liabilities					(612)
Accretion					137
Cash payments					(6,621)
Foreign exchange impact on ending balance					(66)
Accrual balance at end of period	$ 3,194		$ 7,180		3,194
Facilities-related accruals - non-current	537		647		537
Restructuring Charges	(213)			$ 539	2,564	$ 539
Employee-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year		5,509			5,509
New restructuring charges - operating expenses					3,176
Revisions of estimated liabilities					(612)
Accretion					0
Cash payments					(5,962)
Foreign exchange impact on ending balance					(73)
Accrual balance at end of period	2,038		5,509		2,038
Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year		$ 1,671			1,671
New restructuring charges - operating expenses					0
Revisions of estimated liabilities					0
Accretion					137
Cash payments					(659)
Foreign exchange impact on ending balance					7
Accrual balance at end of period	1,156		$ 1,671		1,156
Facilities-related accruals - current	700				700
Facilities-related accruals - non-current	500				500
2016 Plan [Member]
Restructuring accrual [Roll Forward]
Forecasted Restructuring-Related Cost Savings	76,000				$ 76,000
2016 Plan [Member] | Employee-Related [Member]
Restructuring accrual [Roll Forward]
Revisions of estimated liabilities	(600)
Restructuring and Related Cost, Number of Positions Eliminated		63	111
Restructuring Charges	$ 400	$ 2,800	$ 5,800
Scenario, Forecast [Member] | 2016 Plan [Member]
Restructuring accrual [Roll Forward]
Estimated Restructuring Plan Cash Expenditures							$ 25,000