Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 60,353	$ 71,127
Marketable securities	51,079	16,124
Total cash, cash equivalents, and marketable securities	111,432	87,251
Trade accounts receivable, net of allowance of $926 and $1,159	98,293	79,896
Deferred income taxes	9,826	4,770
Income taxes receivable	7,545	9,266
Other current assets	4,865	7,473
Total current assets	231,961	188,656
Property and equipment, net	14,458	11,010
Long-term deferred income taxes	43,286	33,769
Long-term other assets	2,186	2,905
Intangible assets, net	69,369	80,684
Goodwill	20,451	20,451
Total assets	381,711	337,475
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	10,899	6,286
Accrued expenses	18,336	24,736
Accrued compensation and related expenses	39,170	27,125
Deferred revenue	73,840	56,903
Total current liabilities	142,245	115,050
Income taxes payable	9,547	5,783
Long-term deferred revenue	15,367	17,751
Other long-term liabilities	5,796	3,221
Total liabilities	172,955	141,805
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, 70,000 shares authorized; 37,712 shares and 37,250 shares issued and outstanding	377	372
Additional paid-in capital	129,701	122,607
Retained earnings	77,029	71,431
Net unrealized gain (loss) on available-for-sale marketable securities	57	(36)
Foreign currency translation adjustments	1,592	1,296
Total stockholders' equity	208,756	195,670
Total liabilities and stockholders' equity	$ 381,711	$ 337,475