RESTRUCTURING COSTS AND ACCRUALS (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			$ 10,111
New restructuring charges - operating expenses			3,415
Revisions of estimated liabilities			(142)
Non-cash write-offs			3,191
Accretion			278
Cash payments			(8,449)
Foreign exchange impact on ending balance			(31)
Accrual balance at end of period	$ 8,373		8,373
Facilities-related accruals - non-current	843		843		$ 1,256
Restructuring Charges	(582)	$ 5,314	6,464	$ 7,878
Employee-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			7,018
New restructuring charges - operating expenses			1,930
Revisions of estimated liabilities			(902)
Non-cash write-offs			0
Accretion			0
Cash payments			(5,479)
Foreign exchange impact on ending balance			(46)
Accrual balance at end of period	2,521		2,521
Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			3,093
New restructuring charges - operating expenses			1,485
Revisions of estimated liabilities			760	800
Non-cash write-offs			3,191	1,100
Accretion			278
Cash payments			(2,970)
Foreign exchange impact on ending balance			15
Accrual balance at end of period	5,852		5,852
2016 Plan [Member]
Restructuring accrual [Roll Forward]
Revisions of estimated liabilities	600			5,000
Restructuring Charges		$ 5,300	$ 6,500	$ 7,900
Restructuring and Related Cost, Number of Positions Eliminated			64	123
2016 Plan [Member] | Employee-Related [Member]
Restructuring accrual [Roll Forward]
Restructuring Charges			$ 1,000
2016 Plan [Member] | Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Restructuring Charges			5,400	$ 2,900
Accrued Expenses and Other Current Liabilities [Member] | Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Facilities-related accruals - current	1,900		1,900
Other Noncurrent Liabilities [Member] | Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Facilities-related accruals - non-current	800		800
Property, Plant and Equipment [Member] | Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Facilities-related accruals - non-current	$ 3,200		$ 3,200