Consolidated Statements of Stockholders' Equity (USD $)		Total	Series B Preferred Stock [Member]	Scenario, Previously Reported [Member]	Restatement Adjustment [Member]	As Restated [Member]		Common Stock Amount [Member]	Common Stock Amount [Member] Scenario, Previously Reported [Member]	Common Stock Amount [Member] As Restated [Member]		Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Scenario, Previously Reported [Member]	Additional Paid-in Capital [Member] As Restated [Member]		Retained Earnings [Member]	Retained Earnings [Member] Series B Preferred Stock [Member]	Retained Earnings [Member] Scenario, Previously Reported [Member]	Retained Earnings [Member] As Restated [Member]		AccumulatedOtherComprehensiveGain (Loss) [Member]	AccumulatedOtherComprehensiveGain (Loss) [Member] Scenario, Previously Reported [Member]	AccumulatedOtherComprehensiveGain (Loss) [Member] As Restated [Member]		Treasury Stock [Member]	Treasury Stock [Member] Scenario, Previously Reported [Member]	Treasury Stock [Member] As Restated [Member]
Beginning Balance at Dec. 31, 2008				$ 341,495,000		$ 335,969,000	[1]		$ 325,000	$ 325,000	[1]		$ 302,649,000	$ 302,649,000	[1]			$ 56,268,000	$ 50,740,000	[1]		$ (2,017,000)	$ (2,015,000)	[1]		$ (15,730,000)	$ (15,730,000)	[1]
Issuance of common stock:
Issuance of common stock — options		12,580,000						10,000				12,570,000
Issuance of common stock — ESPP		2,269,000						1,000				2,268,000
Vesting of restricted stock units		0						3,000				(3,000)
Stock-based compensation		8,080,000						2,000				8,078,000
Tax benefit - stock compensation		720,000										720,000
Conversion of redeemable preferred stock		30,525,000						22,000				30,503,000
Purchase of treasury stock		(6,543,000)																							(6,543,000)
Net income		27,575,000		26,339,000	1,236,000	27,575,000	[1]									27,575,000
Accumulated other comprehensive gain (loss):
Cash consideration paid for Series B preferred stock in excess of carrying value		(8,593,000)	(8,593,000)			(8,593,000)	[1]										(8,593,000)
Foreign translation adjustment		5,281,000		5,284,000	(3,000)	5,281,000	[1]														5,281,000
Ending Balance at Dec. 31, 2009	[1]					407,863,000				363,000				356,785,000					69,722,000				3,266,000				(22,273,000)
Issuance of common stock:
Issuance of common stock — options		12,192,000						8,000				12,184,000
Issuance of common stock — ESPP		2,701,000						1,000				2,700,000
Issuance of stock in i2 Technologies acquisition, net		167,621,000						63,000				167,558,000
Stock-based compensation		11,494,000						4,000				11,490,000
Conversion of warrants		179,000						0				179,000
Tax benefit - stock compensation		278,000										278,000
Purchase of treasury stock		(4,948,000)																							(4,948,000)
Net income		2,141,000		17,718,000	(15,577,000)	2,141,000	[1]									2,141,000
Accumulated other comprehensive gain (loss):
Unrealized gain (loss) on hedging contracts, net		375,000																			375,000
Cash consideration paid for Series B preferred stock in excess of carrying value	[1]					0
Foreign translation adjustment		4,335,000		5,338,000	(1,004,000)	4,335,000	[1]														4,335,000
Ending Balance at Dec. 31, 2010	[1]					604,231,000				439,000				551,174,000					71,863,000				7,976,000				(27,221,000)
Issuance of common stock:
Issuance of common stock — options		4,503,000						3,000				4,500,000
Issuance of common stock — ESPP		3,455,000						1,000				3,454,000
Stock-based compensation		13,016,000						5,000				13,011,000
Conversion of warrants		671,000						1,000				670,000
Tax benefit - stock compensation		(1,216,000)										(1,216,000)
Purchase of treasury stock		(5,745,000)																							(5,745,000)
Net income		82,688,000														82,688,000
Accumulated other comprehensive gain (loss):
Unrealized gain (loss) on hedging contracts, net		(4,192,000)																			(4,192,000)
Cash consideration paid for Series B preferred stock in excess of carrying value		0
Foreign translation adjustment		(6,238,000)																			(6,238,000)
Ending Balance at Dec. 31, 2011		$ 691,173,000						$ 449,000				$ 571,593,000				$ 154,551,000					$ (2,454,000)				$ (32,966,000)

[1] As restated - See Note 23 “Restatement of Previously Issued Financial Statements” of Notes to Consolidated Financial Statements.