RESTRUCTURING COSTS AND ACCRUALS (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	$ 10,111
New restructuring charges - operating expenses	1,481
Revisions of estimated liabilities	(498)
Accretion	88
Cash payments	(2,642)
Foreign exchange impact on ending balance	(17)
Accrual balance at end of period	8,523
Facilities-related accruals - non-current	1,026		$ 1,256
Restructuring Charges	983	$ 2,777
Employee-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	7,018
New restructuring charges - operating expenses	1,265
Revisions of estimated liabilities	(541)
Accretion	0
Cash payments	(1,902)
Foreign exchange impact on ending balance	(19)
Accrual balance at end of period	5,821
Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	3,093
New restructuring charges - operating expenses	216
Revisions of estimated liabilities	43
Accretion	88
Cash payments	(740)
Foreign exchange impact on ending balance	2
Accrual balance at end of period	2,702
Facilities-related accruals - current	1,700
Facilities-related accruals - non-current	1,000
2016 Plan [Member] | Employee-Related [Member]
Restructuring accrual [Roll Forward]
Revisions of estimated liabilities	$ 500
Restructuring and Related Cost, Number of Positions Eliminated	44	63
Restructuring Charges	$ 1,300	$ 2,800
2016 Plan [Member] | Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Restructuring Charges	200
2012 Plan [Member] [Member] | Facility Closing [Member]
Restructuring accrual [Roll Forward]
Accrual balance at end of period	$ 1,200