RESTRUCTURING COSTS AND ACCRUALS (Details) $ in Thousands	3 Months Ended					9 Months Ended		17 Months Ended
	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 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						6,479
Revisions of estimated liabilities						262
Accretion						211
Cash payments						(8,041)
Foreign exchange impact on ending balance						(64)
Accrual balance at end of period	$ 7,164			$ 7,180		7,164
Facilities-related accruals - non-current	1,513			647		1,513
Restructuring Charges	5,314				$ 0	7,878	$ 539
Non-cash provision for restructuring	1,100					1,137	$ 0
Employee-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			5,509			5,509
New restructuring charges - operating expenses						5,536
Revisions of estimated liabilities						(501)
Accretion						0
Cash payments						(7,053)
Foreign exchange impact on ending balance						(72)
Accrual balance at end of period	3,419			5,509		3,419
Non-cash provision for restructuring	0
Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			$ 1,671			1,671
New restructuring charges - operating expenses						943
Revisions of estimated liabilities						763
Accretion						211
Cash payments						(988)
Foreign exchange impact on ending balance						8
Accrual balance at end of period	3,745			$ 1,671		3,745
Facilities-related accruals - current	1,100					1,100
Facilities-related accruals - non-current	1,500					1,500
Non-cash provision for restructuring	1,100
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	60		63	111
Restructuring Charges	$ 2,400	$ 400	$ 2,800	$ 5,800
2016 Plan [Member] | Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Restructuring Charges	2,100
2012 Plan [Member] [Member] | Facility Closing [Member]
Restructuring accrual [Roll Forward]
Accrual balance at end of period	1,700					$ 1,700
2012 Plan [Member] [Member] | Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Restructuring Charges	$ 800
Scenario, Forecast [Member] | 2016 Plan [Member]
Restructuring accrual [Roll Forward]
Estimated Restructuring Plan Cash Expenditures								$ 25,000