RESTRUCTURING CHARGES - Restructuring Accrual (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Restructuring Reserve [Roll Forward]
Restructuring Reserve - Beginning Balance	$ 3,605	$ 2,743		$ 1,300
Restructuring charges	3,662	5,070		1,889
Payments	(6,127)	(4,084)		(446)
Long-lived assets write-off		(230)
Reserve adjustments	(37)	106		0
Restructuring Reserve - Ending Balance	1,103	3,605		2,743
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve - Beginning Balance	2,005	82		94
Restructuring charges	2,413	4,011
Payments	(4,406)	(2,190)		(370)
Long-lived assets write-off		0
Reserve adjustments	(12)	102		(94)
Restructuring Reserve - Ending Balance	0	2,005		82
Contract Termination Costs
Restructuring Reserve [Roll Forward]
Restructuring Reserve - Beginning Balance	1,600	2,661		1,206
Restructuring charges	825	355		1,437
Payments	(1,322)	(1,420)		(76)
Long-lived assets write-off		0
Reserve adjustments	0	4		94
Restructuring Reserve - Ending Balance	1,103	1,600		2,661
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve - Beginning Balance	0	0		0
Restructuring charges	424	704	[1]	0
Payments	(399)	(474)		0
Long-lived assets write-off		(230)	[1]
Reserve adjustments	(25)	0		0
Restructuring Reserve - Ending Balance	$ 0	$ 0		$ 0

[1] $0.2 million charge related to impairment of property and equipment resulting from the transfer of our research, development and prototype production of the Millios system to our facility in Dornstadt, Germany and the consolidation of global manufacturing in our facility in Fremont, California.