Condensed Consolidating Statements of Income (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Software licenses	$ 33,139	$ 16,276	$ 91,534	$ 72,865
Subscriptions and other recurring revenues	3,738	5,758	12,582	15,851
Maintenance services	68,261	64,186	199,129	181,840
Product revenues	105,138	86,220	303,245	270,556
Consulting services	60,392	65,947	177,069	164,204
Reimbursed expenses	6,033	6,276	17,265	13,687
Service revenues	66,425	72,223	194,334	177,891
Total revenues	171,563	158,443	497,579	448,447
Cost of software licenses	1,009	1,103	3,139	3,020
Amortization of acquired software technology	1,726	1,833	5,393	5,212
Cost of maintenance services	13,704	12,932	42,362	39,192
Cost of product revenues	16,439	15,868	50,894	47,424
Cost of consulting services	44,821	48,976	138,998	124,987
Reimbursed expenses	6,033	6,276	17,265	13,687
Cost of service revenues	50,854	55,252	156,263	138,674
Total cost of revenues	67,293	71,120	207,157	186,098
GROSS PROFIT	104,270	87,323	290,422	262,349
Product development	18,946	17,373	58,889	54,131
Sales and marketing	26,144	20,258	77,748	65,830
General and administrative	16,018	17,546	54,420	55,044
Amortization of intangibles	9,562	9,966	28,872	28,447
Restructuring charges	768	4,172	1,749	16,478	21,000
Acquisition-related costs	0	473	0	8,081
Litigation settlement	0	0	(37,500)	0
Total operating expenses	71,438	69,788	184,178	228,011
OPERATING INCOME (LOSS)	32,832	17,535	106,244	34,338
Interest expense and amortization of loan fees	(6,435)	(6,169)	(19,085)	(18,437)
Interest income and other, net	521	558	2,672	1,039
Income tax provision	(10,115)	(3,651)	(17,381)	(5,069)
Equity in earnings of subsidiaries, net	0	0	0	0
NET INCOME (LOSS)	16,803	8,273	72,450	11,871
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Software licenses	0	0	0	0
Subscriptions and other recurring revenues	0	0	0	0
Maintenance services	0	0	0	0
Product revenues	0	0	0	0
Consulting services	0	0	0	0
Reimbursed expenses	0	0	0	0
Service revenues	0	0	0	0
Total revenues	0	0	0	0
Cost of software licenses	0	0	0	0
Amortization of acquired software technology	0	0	0	0
Cost of maintenance services	0	0	0	0
Cost of product revenues	0	0	0	0
Cost of consulting services	0	0	0	0
Reimbursed expenses	0	0	0	0
Cost of service revenues	0	0	0	0
Total cost of revenues	0	0	0	0
GROSS PROFIT	0	0	0	0
Product development	0	0	0	0
Sales and marketing	0	0	0	0
General and administrative	(54)	0	(120)	0
Amortization of intangibles	0	0	0	0
Restructuring charges	0	0	0	0
Acquisition-related costs		0		0
Litigation settlement			0
Total operating expenses	(54)	0	(120)	0
OPERATING INCOME (LOSS)	54	0	120	0
Interest expense and amortization of loan fees	(6,248)	5,975	(18,499)	17,897
Interest income and other, net	(108)	0	1,100	0
Income tax provision	(2,395)	(2,270)	6,566	(6,801)
Equity in earnings of subsidiaries, net	20,710	11,978	83,163	22,967
NET INCOME (LOSS)	16,803	8,273	72,450	11,871
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Software licenses	33,073	16,276	91,468	72,865
Subscriptions and other recurring revenues	3,738	5,758	12,582	15,851
Maintenance services	47,929	45,980	139,672	126,747
Product revenues	84,740	68,014	243,722	215,463
Consulting services	37,462	45,341	118,429	113,561
Reimbursed expenses	3,763	4,247	11,012	9,430
Service revenues	41,225	49,588	129,441	122,991
Total revenues	125,965	117,602	373,163	338,454
Cost of software licenses	1,009	1,103	3,139	3,020
Amortization of acquired software technology	1,726	1,833	5,393	5,212
Cost of maintenance services	8,565	8,574	26,929	26,422
Cost of product revenues	11,300	11,510	35,461	34,654
Cost of consulting services	27,004	34,722	87,829	88,296
Reimbursed expenses	3,763	4,251	11,012	9,430
Cost of service revenues	30,767	38,973	98,841	97,726
Total cost of revenues	42,067	50,483	134,302	132,380
GROSS PROFIT	83,898	67,119	238,861	206,074
Product development	11,352	10,933	36,271	35,292
Sales and marketing	15,781	12,692	47,299	41,052
General and administrative	12,140	13,553	43,372	43,962
Amortization of intangibles	9,562	9,966	28,872	28,447
Restructuring charges	370	1,898	1,086	10,813
Acquisition-related costs		473		8,081
Litigation settlement			37,500
Total operating expenses	49,205	49,515	119,400	167,647
OPERATING INCOME (LOSS)	34,693	17,604	119,461	38,427
Interest expense and amortization of loan fees	(137)	114	(397)	363
Interest income and other, net	(5,838)	(3,238)	(25,718)	(17,512)
Income tax provision	12,146	5,517	(20,842)	7,805
Equity in earnings of subsidiaries, net	1,728	1,525	(9,911)	8,363
NET INCOME (LOSS)	18,300	10,260	62,593	21,110
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Software licenses	66	0	66	0
Subscriptions and other recurring revenues	0	0	0	0
Maintenance services	20,332	18,206	59,457	55,093
Product revenues	20,398	18,206	59,523	55,093
Consulting services	22,930	20,606	58,640	50,643
Reimbursed expenses	2,270	2,029	6,253	4,257
Service revenues	25,200	22,635	64,893	54,900
Total revenues	45,598	40,841	124,416	109,993
Cost of software licenses	0	0	0	0
Amortization of acquired software technology	0	0	0	0
Cost of maintenance services	5,139	4,358	15,433	12,770
Cost of product revenues	5,139	4,358	15,433	12,770
Cost of consulting services	17,817	14,254	51,169	36,691
Reimbursed expenses	2,270	2,025	6,253	4,257
Cost of service revenues	20,087	16,279	57,422	40,948
Total cost of revenues	25,226	20,637	72,855	53,718
GROSS PROFIT	20,372	20,204	51,561	56,275
Product development	7,594	6,440	22,618	18,839
Sales and marketing	10,363	7,566	30,449	24,778
General and administrative	3,932	3,993	11,168	11,082
Amortization of intangibles	0	0	0	0
Restructuring charges	398	2,274	663	5,665
Acquisition-related costs		0		0
Litigation settlement			0
Total operating expenses	22,287	20,273	64,898	60,364
OPERATING INCOME (LOSS)	(1,915)	(69)	(13,337)	(4,089)
Interest expense and amortization of loan fees	(50)	80	(189)	177
Interest income and other, net	6,467	3,796	27,290	18,551
Income tax provision	364	404	(3,105)	4,065
Equity in earnings of subsidiaries, net	0	0	0	0
NET INCOME (LOSS)	4,138	3,243	10,659	10,220
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Software licenses	0	0	0	0
Subscriptions and other recurring revenues	0	0	0	0
Maintenance services	0	0	0	0
Product revenues	0	0	0	0
Consulting services	0	0	0	0
Reimbursed expenses	0	0	0	0
Service revenues	0	0	0	0
Total revenues	0	0	0	0
Cost of software licenses	0	0	0	0
Amortization of acquired software technology	0	0	0	0
Cost of maintenance services	0	0	0	0
Cost of product revenues	0	0	0	0
Cost of consulting services	0	0	0	0
Reimbursed expenses	0	0	0	0
Cost of service revenues	0	0	0	0
Total cost of revenues	0	0	0	0
GROSS PROFIT	0	0	0	0
Product development	0	0	0	0
Sales and marketing	0	0	0	0
General and administrative	0	0	0	0
Amortization of intangibles	0	0	0	0
Restructuring charges	0	0	0	0
Acquisition-related costs		0		0
Litigation settlement			0
Total operating expenses	0	0	0	0
OPERATING INCOME (LOSS)	0	0	0	0
Interest expense and amortization of loan fees	0	0	0	0
Interest income and other, net	0	0	0	0
Income tax provision	0	0	0	0
Equity in earnings of subsidiaries, net	(22,438)	(13,503)	(73,252)	(31,330)
NET INCOME (LOSS)	$ (22,438)	$ (13,503)	$ (73,252)	$ (31,330)