UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 130,568	$ 70,594
Marketable securities	63,812	63,167
Total cash, cash equivalents, and marketable securities	194,380	133,761
Trade accounts receivable, net of allowance of $6,189 and $4,126	191,161	265,028
Income taxes receivable	34,864	14,155
Other current assets	17,679	12,188
Total current assets	438,084	425,132
Property and equipment, net	39,849	38,281
Deferred income taxes	73,459	69,898
Long-term other assets	5,982	3,990
Intangible assets, net	34,755	44,191
Goodwill	72,941	73,164
Total assets	665,070	654,656
Current liabilities:
Accounts payable	12,535	14,414
Accrued expenses	39,681	36,751
Accrued compensation and related expenses	53,869	60,660
Deferred revenue	160,931	175,647
Total current liabilities	267,016	287,472
Income taxes payable	4,774	4,263
Long-term deferred revenue	6,130	10,989
Other long-term liabilities	15,449	16,043
Total liabilities	293,369	318,767
Stockholders' equity:
Preferred stock, 1,000 shares authorized; no shares issued and outstanding
Common stock, 200,000 shares authorized; 77,839 shares and 76,591 shares issued and outstanding	778	766
Additional paid-in capital	146,728	143,903
Retained earnings	227,953	198,315
Accumulated other comprehensive loss	(3,758)	(7,095)
Total stockholders' equity	371,701	335,889
Total liabilities and stockholders' equity	$ 665,070	$ 654,656