CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 358,676	$ 401,975
Restricted cash	851	737
Short-term investments	259,816	187,408
Accounts receivable, net	73,394	83,319
Prepaid expenses and other current assets	11,718	11,548
Total current assets	704,455	684,987
Property and equipment, net	55,811	57,436
Capitalized software development costs, net	6,998	8,497
Deposits and other assets	5,639	5,695
Deferred tax assets, net	13,633	11,704
Total assets	786,536	768,319
Current liabilities:
Accounts payable and accrued expenses	20,794	36,628
Accrued compensation and employee benefits	33,111	43,323
Deferred revenue and advance payments	132,047	105,535
Total current liabilities	185,952	185,486
Deferred revenue and advance payments	12,634	13,915
Other long-term liabilities	15,614	16,447
Deferred tax liabilities	300	294
Total liabilities	214,500	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	548,184	543,974
Treasury stock, at cost; 6,405 shares	(475,184)	(475,184)
Accumulated other comprehensive loss	(9,961)	(10,743)
Retained earnings	508,979	494,112
Total stockholders' equity	572,036	552,177
Total liabilities and stockholders' equity	786,536	768,319
Class A
Stockholders' Equity
Common stock	16	16
Class B Convertible
Stockholders' Equity
Common stock	$ 2	$ 2