CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 365,555	$ 292,341
Restricted cash	566	618
Short-term investments	213,347	193,320
Accounts receivable, net	58,052	68,154
Prepaid expenses and other current assets	11,597	10,881
Total current assets	649,117	565,314
Property and equipment, net	59,668	65,664
Capitalized software development costs, net	9,997	15,855
Deposits and other assets	5,624	2,072
Deferred tax assets, net	11,103	7,989
Total assets	735,509	656,894
Current liabilities:
Accounts payable and accrued expenses	26,064	31,840
Accrued compensation and employee benefits	41,417	40,067
Accrued restructuring costs	2	56
Deferred revenue and advance payments	115,626	100,695
Total current liabilities	183,109	172,658
Deferred revenue and advance payments	15,151	8,995
Other long-term liabilities	17,221	19,943
Deferred tax liabilities	127	17
Total liabilities	215,608	201,613
Commitments and Contingencies
Stockholders' Equity
Preferred stock undesignated, $0.001 par value; 5,000 shares authorized; no shares issued or outstanding	0	0
Additional paid-in capital	540,038	534,651
Treasury stock, at cost; 6,405 shares	(475,184)	(475,184)
Accumulated other comprehensive loss	(7,959)	(7,408)
Retained earnings	462,988	403,204
Total stockholders' equity	519,901	455,281
Total liabilities and stockholders' equity	735,509	656,894
Class A
Stockholders' Equity
Common stock	16	16
Class B Convertible
Stockholders' Equity
Common stock	$ 2	$ 2