Restatement of Previously Issued Financial Statements Income Statement Restatement (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011 Scenario, Previously Reported [Member]	Sep. 30, 2011 Scenario, Previously Reported [Member]	Sep. 30, 2011 Scenario, Adjustment [Member]	Sep. 30, 2011 Scenario, Adjustment [Member]	Sep. 30, 2011 As Restated [Member]		Sep. 30, 2011 As Restated [Member]
Software licenses	$ 27,544		$ 84,977	$ 33,139	$ 91,534	$ 1,587	$ 9,057	$ 34,726	[1]	$ 100,591	[1]
Maintenance services	68,784		202,312	68,261	199,129	(629)	(584)	67,632	[1]	198,545	[1]
Product revenues	100,237		298,984	105,138	303,245	958	8,473	106,096	[1]	311,718	[1]
Consulting services	59,090		179,852	60,392	177,069	578	87	60,970	[1]	177,156	[1]
Service revenues	64,283		196,479	66,425	194,334	578	87	67,003	[1]	194,421	[1]
Total revenues	164,520		495,463	171,563	497,579	1,536	8,560	173,099	[1]	506,139	[1]
Cost of maintenance services	14,101		42,435	13,704	42,362	(50)	14	13,654	[1]	42,376	[1]
Cost of product revenues	16,837		51,011	16,439	50,894	(50)	14	16,389	[1]	50,908	[1]
Cost of consulting services	45,733		137,638	44,821	138,998	(316)	(983)	44,505	[1]	138,015	[1]
Cost of service revenues	50,926		154,265	50,854	156,263	(316)	(983)	50,538	[1]	155,280	[1]
Total cost of revenues	67,763		205,276	67,293	207,157	(366)	(969)	66,927	[1]	206,188	[1]
GROSS PROFIT	96,757		290,187	104,270	290,422	1,902	9,529	106,172	[1]	299,951	[1]
Product development	18,297		56,101	18,946	58,889	(199)	(288)	18,747	[1]	58,601	[1]
Sales and marketing	24,265		73,632	26,144	77,748	(388)	(388)	25,756	[1]	77,360	[1]
General and administrative	21,009		70,354	16,018	54,420	(203)	68	15,815	[1]	54,488	[1]
Restructuring charges	(163)		2,280	768	1,749	0	(470)	768	[1]	1,279	[1]
Total operating expenses	72,938		230,957	71,438	184,178	(790)	(1,078)	70,648	[1]	183,100	[1]
OPERATING INCOME	23,819		59,230	32,832	106,244	2,692	10,607	35,524	[1]	116,851	[1]
Interest income and other, net	(1,253)		(3,192)	(521)	(2,672)	(120)	31	(641)	[1]	(2,641)	[1]
INCOME BEFORE INCOME TAXES	18,464		42,860	26,918	89,831	2,812	10,576	29,730	[1]	100,407	[1]
Income tax provision	7,413	11,400	16,505	10,115	17,381	1,328	3,913	11,443	[1]	21,294	[1]
NET INCOME	$ 11,051		$ 26,355	$ 16,803	$ 72,450	$ 1,484	$ 6,663	$ 18,287	[1]	$ 79,113	[1]
Basic net income per common share	$ 0.26		$ 0.62	$ 0.40	$ 1.71	$ 0.03	$ 0.16	$ 0.43	[1]	$ 1.87	[1]
Diluted net income per common share	$ 0.26		$ 0.61	$ 0.39	$ 1.70	$ 0.04	$ 0.15	$ 0.43	[1]	$ 1.85	[1]

[1] (1) As restated - See Note 14 “Restatement of Previously Issued Financial Statements” of Notes to Condensed Consolidated Financial Statements.See notes to Condensed Consolidated Financial Statements.