RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS Revised Consolidated Statements of Operations (Details) (USD $) Share data 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	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 5,927,000				$ 7,644,000				$ 5,927,000	$ 7,644,000		$ 7,268,000
Products									395,531,000	478,830,000	660,720,000
Services									167,881,000	156,873,000
Total net revenues	147,103,000	138,893,000	141,345,000	136,071,000	160,469,000				563,412,000	635,703,000	766,885,000
Products									159,264,000	182,764,000
Services									63,177,000	63,670,000
Amortization of intangible assets	158,000	158,000	501,000	651,000	646,000				1,468,000	2,574,000
Total cost of revenues	59,801,000	56,055,000	54,294,000	52,291,000	64,210,000				223,909,000	249,008,000
Gross profit	87,144,000	82,680,000	86,550,000	83,129,000	95,613,000				339,503,000	386,695,000
Research and Development Expense	24,556,000	23,239,000	23,847,000	23,607,000	22,951,000				95,249,000	98,879,000
Selling and Marketing Expense	34,566,000	31,512,000	33,903,000	33,909,000	35,385,000				133,890,000	153,481,000
General and Administrative Expense	23,135,000	22,715,000	16,131,000	15,597,000	13,462,000				77,578,000	52,066,000
Amortization of intangible assets	667,000	660,000	658,000	663,000	755,000				2,648,000	4,254,000
Restructuring costs, net	2,491,000	688,000	1,918,000	273,000	126,000				5,370,000	24,838,000
Gain (Loss) on Sale of Other Assets									(125,000)	(252,000)
Total operating expenses	85,415,000	78,814,000	76,457,000	74,049,000	72,679,000				314,735,000	333,518,000
Operating (loss) income	1,729,000	3,866,000	10,093,000	9,080,000	22,934,000				24,768,000	53,177,000
Interest income									555,000	210,000
Interest Expense									(1,574,000)	(1,548,000)
Other expense, net	192,000	(363,000)	(247,000)	(258,000)	(1,150,000)				343,000	(703,000)
Income from continuing operations before income taxes	1,921,000	3,503,000	9,846,000	8,822,000	21,784,000				24,092,000	51,136,000	163,095,000
Income Tax Expense (Benefit)	792,000	921,000	669,000	557,000	1,119,000				2,939,000	4,049,000	635,000
Income (Loss) from Continuing Operations, Net of Tax	1,129,000	2,582,000	9,177,000	8,265,000	20,665,000	14,776,000	640,000	11,006,000	21,153,000	47,087,000
Income from divested operations	0	0	0	0	0	0	(2,773,000)	(5,059,000)	0	(7,832,000)
Income from discontinued operations, net of tax	0	0	0	0	0	37,972,000	2,773,000	5,059,000	0	45,804,000
Net income	1,129,000	2,582,000	9,177,000	8,265,000	20,665,000				21,153,000	92,891,000	226,367,000
Income (loss) from continuing operations, net of tax - 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 (Loss) Per Share, Basic	$ 0.03	$ 0.07	$ 0.24	$ 0.21	$ 0.53				$ 0.54	$ 2.39
Income per share from continuing operations, net of tax – 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 (Loss) 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	39,080	39,075	39,040	38,977	38,916				39,044	38,804
Weighted Average Number of Shares Outstanding, Diluted	39,111	39,076	39,069	39,034	38,937				39,070	38,836
Accrued Withholding Taxes Understatement	3,800,000								3,800,000
Scenario, Actual [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax											7,038,000	9,211,000
Products											660,720,000
Services											106,165,000
Total net revenues											766,885,000
Products											188,217,000
Services											70,808,000
Amortization of intangible assets											2,693,000
Total cost of revenues											261,718,000
Gross profit											505,167,000
Research and Development Expense											111,129,000
Selling and Marketing Expense											163,204,000
General and Administrative Expense											50,732,000
Amortization of intangible assets											8,528,000
Restructuring costs, net											6,534,000
Gain (Loss) on Sale of Other Assets											597,000
Total operating expenses											340,127,000
Operating (loss) income											165,040,000
Interest income											142,000
Interest Expense											(1,928,000)
Other expense, net											(159,000)
Income from continuing operations before income taxes											163,095,000
Income Tax Expense (Benefit)											635,000
Income (Loss) from Continuing Operations, Net of Tax											162,460,000
Income from divested operations											(63,907,000)
Income from discontinued operations, net of tax											63,907,000
Net income											226,367,000
Income (loss) from continuing operations, net of tax - basic											$ 4.23
Income per share from discontinued operations – basic											$ 1.66
Net Income (Loss) Per Share, Basic											$ 5.89
Income per share from continuing operations, net of tax – diluted											$ 4.22
Income (loss) per share from discontinued operations – diluted											$ 1.67
Net Income (Loss) Per Share, Diluted											$ 5.87
Weighted Average Number of Shares Outstanding, Basic											38,435
Weighted Average Number of Shares Outstanding, Diluted											38,534
Restatement Adjustment [Member]
Products											270,219,000
Services											(25,400,000)
Total net revenues											244,819,000
Products											0
Services											0
Amortization of intangible assets											0
Total cost of revenues											0
Gross profit											244,819,000
Research and Development Expense											0
Selling and Marketing Expense											0
General and Administrative Expense											0
Amortization of intangible assets											0
Restructuring costs, net											0
Gain (Loss) on Sale of Other Assets											0
Total operating expenses											0
Operating (loss) income											244,819,000
Interest income											0
Interest Expense											0
Other expense, net											0
Income from continuing operations before income taxes											244,819,000
Income Tax Expense (Benefit)											0
Income (Loss) from Continuing Operations, Net of Tax											244,819,000
Income from divested operations											0
Income from discontinued operations, net of tax											0
Net income											244,819,000
Other Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax											288,000	303,000
Products											0
Services											0
Total net revenues											0
Products											1,153,000
Services											8,326,000
Amortization of intangible assets											0
Total cost of revenues											9,479,000
Gross profit											(9,479,000)
Research and Development Expense											252,000
Selling and Marketing Expense											(9,897,000)
General and Administrative Expense											(2,419,000)
Amortization of intangible assets											0
Restructuring costs, net											(2,324,000)
Gain (Loss) on Sale of Other Assets											0
Total operating expenses											(14,388,000)
Operating (loss) income											4,909,000
Interest income											(2,000)
Interest Expense											125,000
Other expense, net											0
Income from continuing operations before income taxes											5,032,000
Income Tax Expense (Benefit)											(307,000)
Income (Loss) from Continuing Operations, Net of Tax											5,339,000
Income from divested operations											0
Income from discontinued operations, net of tax											0
Net income											5,339,000
Discontinued Operations [Member]
Products											(155,870,000)
Services											0
Total net revenues											(155,870,000)
Products											(68,671,000)
Services											0
Amortization of intangible assets											0
Total cost of revenues											(68,671,000)
Gross profit											(87,199,000)
Research and Development Expense											(7,231,000)
Selling and Marketing Expense											(10,764,000)
General and Administrative Expense											(5,297,000)
Amortization of intangible assets											0
Restructuring costs, net											0
Gain (Loss) on Sale of Other Assets											0
Total operating expenses											(23,292,000)
Operating (loss) income											(63,907,000)
Interest income											0
Interest Expense											0
Other expense, net											0
Income from continuing operations before income taxes											(63,907,000)
Income Tax Expense (Benefit)											0
Income (Loss) from Continuing Operations, Net of Tax											(63,907,000)
Income from divested operations											(63,907,000)
Income from discontinued operations, net of tax											63,907,000
Net income											0
Scenario, Previously Reported [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax											4,807,000
Products											546,371,000
Services											131,565,000
Total net revenues											677,936,000
Products											255,735,000
Services											62,482,000
Amortization of intangible assets											2,693,000
Total cost of revenues											320,910,000
Gross profit											357,026,000
Research and Development Expense											118,108,000
Selling and Marketing Expense											183,865,000
General and Administrative Expense											58,448,000
Amortization of intangible assets											8,528,000
Restructuring costs, net											8,858,000
Gain (Loss) on Sale of Other Assets											597,000
Total operating expenses											377,807,000
Operating (loss) income											(20,781,000)
Interest income											144,000
Interest Expense											(2,053,000)
Other expense, net											(159,000)
Income from continuing operations before income taxes											(22,849,000)
Income Tax Expense (Benefit)											942,000
Income (Loss) from Continuing Operations, Net of Tax											(23,791,000)
Income from divested operations											0
Income from discontinued operations, net of tax											0
Net income											$ (23,791,000)
Income (loss) from continuing operations, net of tax - basic											$ (0.62)
Income per share from discontinued operations – basic											$ 0.00
Net Income (Loss) Per Share, Basic											$ (0.62)
Income per share from continuing operations, net of tax – diluted											$ (0.62)
Income (loss) per share from discontinued operations – diluted											$ 0.00
Net Income (Loss) Per Share, Diluted											$ (0.62)
Weighted Average Number of Shares Outstanding, Basic											38,435
Weighted Average Number of Shares Outstanding, Diluted											38,435