CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 127,111	$ 80,231
Marketable securities	89,102	76,461
Total cash, cash equivalents, and marketable securities	216,213	156,692
Trade accounts receivable, net of allowance of $1,865 and $1,997	114,642	165,628
Deferred income taxes	12,052	12,014
Income taxes receivable	11,690	4,708
Other current assets	8,982	9,148
Total current assets	363,579	348,190
Property and equipment, net	27,223	28,957
Long-term deferred income taxes	61,264	60,291
Long-term other assets	2,998	2,526
Intangible assets, net	50,060	56,574
Goodwill	40,463	40,329
Total assets	545,587	536,867
Current liabilities:
Accounts payable	6,827	3,678
Accrued expenses	31,609	31,814
Accrued compensation and related expenses	42,397	44,399
Deferred revenue	120,501	110,882
Total current liabilities	201,334	190,773
Income taxes payable	21,469	21,269
Long-term deferred revenue	24,535	34,196
Other long-term liabilities	17,693	18,841
Total liabilities	265,031	265,079
Stockholders' equity:
Preferred stock, 1,000 shares authorized; no shares issued and outstanding	0	0
Common stock, 200,000 shares authorized; 76,348 shares and 76,324 shares issued and outstanding	763	764
Additional paid-in capital	139,198	139,565
Retained earnings	135,658	127,826
Accumulated other comprehensive income	4,937	3,633
Total stockholders' equity	280,556	271,788
Total liabilities and stockholders' equity	$ 545,587	$ 536,867