QUARTERLY RESULTS (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating expenses [Abstract]
Net revenues	$ 147,103	$ 138,893	$ 141,345	$ 136,071	$ 160,469				$ 563,412	$ 635,703	$ 766,885
Cost of revenues	59,801	56,055	54,294	52,291	64,210				223,909	249,008
Amortization of intangible assets	158	158	501	651	646				1,468	2,574
Gross profit	87,144	82,680	86,550	83,129	95,613				339,503	386,695
Research and development	24,556	23,239	23,847	23,607	22,951				95,249	98,879
Marketing and selling	34,566	31,512	33,903	33,909	35,385				133,890	153,481
General and administrative	23,135	22,715	16,131	15,597	13,462				77,578	52,066
Amortization of intangible assets	667	660	658	663	755				2,648	4,254
Restructuring costs, net	2,491	688	1,918	273	126				5,370	24,838
Loss (gain) on sales of assets									(125)	(252)
Total operating expenses	85,415	78,814	76,457	74,049	72,679				314,735	333,518
Operating (loss) income	1,729	3,866	10,093	9,080	22,934				24,768	53,177
Other income (expense), net	192	(363)	(247)	(258)	(1,150)				343	(703)
Income from continuing operations before income taxes	1,921	3,503	9,846	8,822	21,784				24,092	51,136	163,095
Provision for (benefit from) income taxes, net	792	921	669	557	1,119				2,939	4,049	635
Income (Loss) from Continuing Operations, Net of Tax	1,129	2,582	9,177	8,265	20,665	14,776	640	11,006	21,153	47,087
Gain on divestiture of consumer business	0	0	0	0	0	37,972	0	0
Income from divested operations	0	0	0	0	0	0	(2,773)	(5,059)	0	(7,832)
Loss from discontinued operations	0	0	0	0	0	37,972	2,773	5,059	0	45,804
Net income	1,129	2,582	9,177	8,265	20,665				21,153	92,891	226,367
Income (loss) per share from continuing operations – basic	$ 0.03	$ 0.07	$ 0.24	$ 0.21	$ 0.53	$ 0.38	$ 0.02	$ 0.29	$ 0.54	$ 1.21
Income per share from discontinued operations – basic	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.98	$ 0.07	$ 0.13	$ 0.00	$ 1.18
Net income per share - basic	$ 0.03	$ 0.07	$ 0.24	$ 0.21	$ 0.53				$ 0.54	$ 2.39
Income (loss) per share from continuing operations – diluted	$ 0.03	$ 0.07	$ 0.23	$ 0.21	$ 0.53	$ 0.38	$ 0.02	$ 0.28	$ 0.54	$ 1.21	$ 4.22
Income (loss) per share from discontinued operations – diluted	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.98	$ 0.07	$ 0.13	$ 0.00	$ 1.18	$ 1.65
Net income per share - diluted	$ 0.03	$ 0.07	$ 0.23	$ 0.21	$ 0.53				$ 0.54	$ 2.39	$ 5.87
Weighted Average Number of Shares Outstanding, Basic (in shares)	39,080	39,075	39,040	38,977	38,916				39,044	38,804
Weighted Average Number of Shares Outstanding, Diluted (in shares)	39,111	39,076	39,069	39,034	38,937				39,070	38,836
As Restated [Member]
Operating expenses [Abstract]
Net revenues						150,607	165,476	159,151
Cost of revenues						55,019	67,312	59,893
Amortization of intangible assets						634	644	650
Gross profit						94,954	97,520	98,608
Research and development						23,207	26,261	26,460
Marketing and selling						33,941	42,282	41,873
General and administrative						10,905	13,351	14,348
Amortization of intangible assets						782	1,106	1,611
Restructuring costs, net						9,831	14,437	444
Total operating expenses						78,666	97,437	84,736
Operating (loss) income						16,288	83	13,872
Other income (expense), net						(318)	(379)	(194)
Income from continuing operations before income taxes						15,970	(296)	13,678
Provision for (benefit from) income taxes, net						1,194	(936)	2,672
Net income						$ 52,748	$ 3,413	$ 16,065
Net income per share - basic						$ 1.36	$ 0.09	$ 0.42
Net income per share - diluted						$ 1.36	$ 0.09	$ 0.41
Weighted Average Number of Shares Outstanding, Basic (in shares)						38,859	38,778	38,662
Weighted Average Number of Shares Outstanding, Diluted (in shares)						38,890	38,798	38,721