CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 386,855	$ 401,975
Restricted cash	764	737
Short-term investments	259,249	187,408
Accounts receivable, net	66,337	83,319
Prepaid expenses and other current assets	17,649	11,548
Total current assets	730,854	684,987
Property and equipment, net	53,712	57,436
Capitalized software development costs, net	3,999	8,497
Deposits and other assets	7,099	5,695
Deferred tax assets, net	17,988	11,704
Total assets	813,652	768,319
Current liabilities:
Accounts payable and accrued expenses	25,368	36,628
Accrued compensation and employee benefits	36,039	43,323
Deferred revenue and advance payments, net	115,420	105,535
Total current liabilities	176,827	185,486
Deferred revenue and advance payments, net	9,767	13,915
Other long-term liabilities	14,560	16,447
Deferred tax liabilities	159	294
Total liabilities	201,313	216,142
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	556,209	543,974
Treasury stock, at cost; 6,405 shares	(475,184)	(475,184)
Accumulated other comprehensive loss	(6,683)	(10,743)
Retained earnings	537,979	494,112
Total stockholders' equity	612,339	552,177
Total liabilities and stockholders' equity	813,652	768,319
Class A
Stockholders' Equity
Common stock	16	16
Class B Convertible
Stockholders' Equity
Common stock	$ 2	$ 2