RESTRUCTURING COSTS AND ACCRUALS (Details) $ in Thousands	2 Months Ended		3 Months Ended								7 Months Ended	9 Months Ended	12 Months Ended			19 Months Ended
	Feb. 29, 2016 USD ($) position	Dec. 31, 2013 USD ($) position	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) position	Dec. 31, 2012 USD ($) position	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jun. 30, 2017 USD ($)	Jan. 01, 2016 USD ($)
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	$ 7,180					$ 2,343				$ 8,501			$ 2,343	$ 8,501	$ 15,731
New restructuring charges													5,766	0	3,539
Revisions of estimated liabilities													539	(165)	1,831
Accretion													226	565	612
Cash payments													(1,616)	(6,512)	(13,205)
Foreign exchange impact on ending balance													(78)	(46)	(7)
Accrual balance at end of period		$ 8,501	$ 7,180				$ 2,343				$ 8,501	$ 15,731	7,180	2,343	8,501
Restructuring charges			5,766	$ 0	$ 539	0	0	$ 0	$ (165)	0			6,305	(165)	5,370
Facilties-related accuals - noncurrent			647				1,334						647	1,334
Employee-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	5,509					58				2,399			58	2,399	4,298
New restructuring charges													5,766	0	3,539
Revisions of estimated liabilities													0	0	50
Accretion													0	0	0
Cash payments													(315)	(2,340)	(5,469)
Foreign exchange impact on ending balance													0	(1)	(19)
Accrual balance at end of period		2,399	5,509				58				2,399	4,298	5,509	58	2,399
Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	1,671					$ 2,285				$ 6,102			2,285	6,102	11,433
New restructuring charges													0	0	0
Revisions of estimated liabilities													539	(165)	1,781
Accretion													226	565	612
Cash payments													(1,301)	(4,172)	(7,736)
Foreign exchange impact on ending balance													(78)	(45)	12
Accrual balance at end of period		6,102	1,671				2,285				$ 6,102	$ 11,433	1,671	2,285	6,102
Facilities-related accruals - current			1,000				1,000						1,000	1,000
Facilties-related accuals - noncurrent			600				$ 1,300						600	$ 1,300
Restructuring Plan 2016 [Member] | Employee-Related [Member]
Restructuring accrual [Roll Forward]
Restructuring charges			5,800
Restructuring Plan 2013 [Member] | Employee-Related [Member]
Restructuring accrual [Roll Forward]
Number of positions eliminated | position											31
Severance costs		$ 1,700									$ 1,700
Restructuring Plan 2013 [Member] | Employee-Related [Member] | Hardware Shared Services Group [Member]
Restructuring accrual [Roll Forward]
Number of positions eliminated | position		29
Restructuring Plan 2013 [Member] | Employee-Related [Member] | Supply and Technology Group [Member]
Restructuring accrual [Roll Forward]
Number of positions eliminated | position		15
Restructuring Plan 2013 [Member] | Employee-Related [Member] | Engineering Department [Member]
Restructuring accrual [Roll Forward]
Number of positions eliminated | position		4
Restructuring Plan 2012 [Member] | Employee-Related [Member]
Restructuring accrual [Roll Forward]
Number of positions eliminated | position												280
Severance costs												$ 13,900			100
Restructuring Plan 2012 [Member] | Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Revisions of estimated liabilities					$ 500				$ 200
Non-cash write-offs												1,400
Restructuring plan, estimate revision															$ 1,800
Restructuring costs, closure of facilities												8,600
Deferred rent liability write-off												$ 1,000
Restructuring Plan 2008 [Member] | Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	$ 300
Accrual balance at end of period			$ 300										$ 300
Subsequent Event [Member] | Restructuring Plan 2016 [Member]
Restructuring accrual [Roll Forward]
Estimated restructuring-related cash expenditures																$ 25,000
Estimated restructuring charges																$ 14,000
Restructuring-related estimated cost savings																	$ 68,000
Number of positions eliminated | position	111