CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 77,525	$ 60,353
Marketable securities	45,460	51,079
Total cash, cash equivalents, and marketable securities	122,985	111,432
Trade accounts receivable, net of allowance of $963 and $926	134,066	98,293
Deferred income taxes	10,202	9,826
Income taxes receivable	6,261	7,545
Other current assets	5,496	4,865
Total current assets	279,010	231,961
Property and equipment, net	30,827	14,458
Long-term deferred income taxes	49,292	43,286
Long-term other assets	1,680	2,186
Intangible assets, net	58,232	69,369
Goodwill	20,451	20,451
Total assets	439,492	381,711
Current liabilities:
Accounts payable	3,330	10,899
Accrued expenses	15,534	18,336
Accrued compensation and related expenses	40,715	39,170
Deferred revenue	95,546	73,840
Total current liabilities	155,125	142,245
Income taxes payable	13,551	9,547
Long-term deferred revenue	18,719	15,367
Other long-term liabilities	15,618	5,796
Total liabilities	203,013	172,955
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 1,000 shares authorized; no shares issued and outstanding
Common stock, $0.01 par value, 100,000 shares and 70,000 shares authorized; 37,945 shares and 37,712 shares issued and outstanding	379	377
Additional paid-in capital	138,576	129,701
Retained earnings	94,349	77,029
Accumulated other comprehensive income:
Net unrealized gain on available-for-sale marketable securities	88	57
Foreign currency translation adjustments	3,087	1,592
Total stockholders' equity	236,479	208,756
Total liabilities and stockholders' equity	$ 439,492	$ 381,711