Financial Statement Detail (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Recurring revenues
Term license revenues	$ 47,087	$ 39,352	$ 133,369	$ 117,733
Perpetual maintenance revenues	16,632	17,071	49,401	50,380
Asset under administration revenues	1,471	1,653	6,376	5,189
Other recurring revenues	22,926	23,014	71,716	67,450
Total recurring revenues	88,116	81,090	260,862	240,752
Non-recurring revenues
Professional services and other revenues	8,281	8,488	22,675	23,835
Perpetual license fees	370	596	1,843	2,215
Total non-recurring revenues	$ 8,651	$ 9,084	$ 24,518	$ 26,050