RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS Revised Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
Cash and cash equivalents	$ 32,855	$ 48,203	$ 70,390
Accounts receivable		56,770	67,956
Inventories		60,122	69,143
Deferred tax assets, net		(14)	(203)
Prepaid expenses		7,778	9,060
Other current assets		17,493	19,950
Total current assets		190,888	237,085
Property and equipment, net		35,186	41,441
Cumulative-effect adjustments due to adoption of ASU No. 2010-28	(419,368)
Intangible assets, net		4,260	9,217
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent		2,415	2,825
Other long-term assets		2,393	3,793
Total assets		235,142	294,361
Accounts payable		33,990	35,425
Accrued compensation and benefits		30,342	25,177
Accrued expenses and other current liabilities		41,273	34,003
Income taxes payable		6,875	7,969
Deferred Tax Liabilities, Net, Current		14	203
Deferred revenues		211,403	230,305
Total current liabilities		323,897	333,082
Long-term deferred tax liabilities, net		565	713
Long-term liabilities		14,586	17,978
Total liabilities		594,477	679,953
Common stock		423	423	423
Additional paid-in capital		1,043,384	1,039,562	1,005,198
Accumulated deficit		(1,336,526)	(1,357,679)	(495,254)
Treasury stock at cost, net of reissuances		72,543	75,542	91,025
Accumulated other comprehensive income		5,927	7,644	7,268
Total stockholders’ equity		(359,335)	(385,592)	426,610
Total liabilities and stockholders’ equity		235,142	294,361
Scenario, Previously Reported [Member]
Cash and cash equivalents	32,855			42,782
Goodwill	0			246,997
Cumulative-effect adjustments due to adoption of ASU No. 2010-28	172,371
Additional paid-in capital	1,018,604
Accumulated other comprehensive income	4,807
Goodwill impairment	(419,368)
Foreign exchange adjustments	(419,368)
Scenario, Actual [Member]
Cash and cash equivalents	32,855			42,782
Cumulative-effect adjustments due to adoption of ASU No. 2010-28	(419,368)
Common stock				423
Additional paid-in capital	1,028,798			1,017,402
Accumulated deficit				(1,246,347)
Treasury stock at cost, net of reissuances				91,025
Accumulated other comprehensive income	7,038			9,211
Total stockholders’ equity				$ (310,336)