FINANCIAL INFORMATION Revised Consolidated Balance Sheets (Details) (USD $)	Jun. 30, 2012		Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2012 Q1 2012 Revised Financial Statements [Member]	Dec. 31, 2011 Q1 2012 Revised Financial Statements [Member]	Dec. 31, 2010 Q1 2012 Revised Financial Statements [Member]	Dec. 31, 2009 Q1 2012 Revised Financial Statements [Member]	Dec. 31, 2011 As Reported [Member]	Dec. 31, 2011 As Revised [Member]
Accrued withholding taxes understatement						$ 3,800,000
Interest and penalties on withholding tax understatement						1,100,000	1,000,000
Interest on withholding tax understatement						700,000	600,000
Penalties on withholding tax understatement						400,000	400,000
Increase in accumulated deficit							(7,900,000)	(8,200,000)	(6,300,000)
Current assets:
Cash and cash equivalents	59,383,000		32,855,000	37,557,000	42,782,000					32,855,000	32,855,000
Accounts receivable	89,180,000		104,305,000							104,305,000	104,305,000
Inventories	77,032,000		111,397,000							111,833,000	111,397,000
Deferred tax assets, net	1,462,000		1,480,000							1,480,000	1,480,000
Prepaid expenses	8,580,000		7,652,000							7,652,000	7,652,000
Other current assets	15,948,000		14,405,000							14,509,000	14,405,000
Total current assets	264,525,000		272,094,000							272,634,000	272,094,000
Property and equipment, net	48,976,000		53,487,000							53,487,000	53,487,000
Intangible assets, net	10,996,000		18,524,000							18,524,000	18,524,000
Goodwill	238,338,000	[1]	246,592,000							246,398,000	246,592,000
Other assets	8,496,000		11,568,000							11,568,000	11,568,000
Total assets	571,331,000		602,265,000							602,611,000	602,265,000
Current liabilities:
Accounts payable	38,990,000		42,533,000							42,533,000	42,533,000
Accrued compensation and benefits	26,411,000		31,750,000							31,350,000	31,750,000
Accrued expenses and other current liabilities	46,023,000		35,108,000							34,174,000	35,108,000
Income taxes payable	10,877,000		8,950,000							3,898,000	8,950,000
Deferred revenues	57,015,000		45,768,000							45,768,000	45,768,000
Total current liabilities	179,316,000		164,109,000							157,723,000	164,109,000
Long-term liabilities	29,704,000		27,885,000							27,885,000	27,885,000
Total liabilities	209,020,000		191,994,000							185,608,000	191,994,000
Stockholders' equity:
Common stock	423,000		423,000							423,000	423,000
Additional paid-in capital	1,024,082,000		1,019,200,000							1,018,604,000	1,019,200,000
Accumulated deficit	(588,426,000)		(532,477,000)							(524,530,000)	(532,477,000)
Treasury stock at cost, net of reissuances	(78,008,000)		(82,301,000)							(82,301,000)	(82,301,000)
Accumulated other comprehensive income	4,240,000		5,426,000							4,807,000	5,426,000
Total stockholders' equity	362,311,000		410,271,000							417,003,000	410,271,000
Total liabilities and stockholders' equity	$ 571,331,000		$ 602,265,000							$ 602,611,000	$ 602,265,000

[1] (a) The June 30, 2012 gross and net goodwill amounts include total foreign currency translation decreases of approximately $0.2 million from the December 31, 2011 amounts.