CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 136,545	$ 80,231
Marketable securities	92,026	76,461
Total cash, cash equivalents, and marketable securities	228,571	156,692
Trade accounts receivable, net of allowance of $1,589 and $1,997	103,439	165,641
Deferred income taxes	12,328	12,336
Income taxes receivable	11,949	4,392
Other current assets	10,096	9,148
Total current assets	366,383	348,209
Property and equipment, net	28,881	28,957
Long-term deferred income taxes	58,129	56,745
Long-term other assets	2,882	2,526
Intangible assets, net	47,880	56,574
Goodwill	45,009	43,469
Total assets	549,164	536,480
Current liabilities:
Accounts payable	8,060	3,671
Accrued expenses	35,039	31,624
Accrued compensation and related expenses	40,462	44,401
Deferred revenue	128,259	110,690
Total current liabilities	211,820	190,386
Income taxes payable	20,951	21,269
Long-term deferred revenue	20,645	34,196
Other long-term liabilities	17,473	18,841
Total liabilities	270,889	264,692
Stockholders' equity:
Preferred stock, 1,000 shares authorized; no shares issued and outstanding
Common stock, 200,000 shares and 100,000 shares authorized; 76,381 shares and 76,324 shares issued and outstanding	764	764
Additional paid-in capital	140,464	139,565
Retained earnings	135,246	127,826
Accumulated other comprehensive income	1,801	3,633
Total stockholders' equity	278,275	271,788
Total liabilities and stockholders' equity	$ 549,164	$ 536,480