COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended			24 Months Ended
	Dec. 31, 2014 Y	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2011
Future minimum lease commitments under non-cancelable leases [Abstract]
2015	$ 14,964,000
2016	13,353,000
2017	11,796,000
2018	9,723,000
2019	9,702,000
Thereafter	10,128,000
Total	69,666,000
Operating Lease Commitments [Abstract]
Restructuring Reserve	2,343,000	8,501,000	15,731,000	8,501,000	10,896,000
Rent expense under operating leases, net of operating subleases	15,000,000	16,300,000	18,100,000
Operating Leases, Income Statement, Sublease Revenue	700,000			0
Contingencies [Abstract]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	2,500,000
Purchase Commitments [Abstract]
Maximum purchase commitment period (in years)	1
Aggregate total of non-cancelable purchase commitments	22,500,000
Product warranty accrual [Roll Forward]
Accrual balance at beginning of year	3,501,000	4,476,000	5,100,000
Accruals for product warranties	3,985,000	5,346,000	7,737,000
Cost of warranty claims	(4,694,000)	(6,321,000)	(7,854,000)
Allocation to divested consumer business			(507,000)
Accrual balance at end of period	2,792,000	3,501,000	4,476,000	3,501,000
Operating Leases on Vacated Facilities [Member]
Operating Lease Commitments [Abstract]
Aggregate obligation of vacated facilies	(8,200,000)
Restructuring Reserve	2,300,000
Early termination penalties if options exercised	600,000
Standby Letters of Credit [Member]
Operating Lease Commitments [Abstract]
Letters of Credit Outstanding, Amount	1,300,000
Standby Letters of Credit [Member] | Office Space - Burlington, Massachusetts [Member]
Operating Lease Commitments [Abstract]
Number of renewal options on corporate office space in Burlington, Massachusetts	2
Maximum exposure	2,600,000
Minimum exposure	1,200,000
Opengate Litigation [Member]
Contingencies [Abstract]
Amount assessed and paid related to social taxes on stock-based compensation	$ 2,600,000