CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 429,276	$ 456,727
Restricted cash	2,742	1,089
Short-term investments	109,946	108,919
Accounts receivable, net	124,935	163,516
Prepaid expenses and other current assets	26,163	23,195
Total current assets	693,062	753,446
Property and equipment, net	47,623	50,154
Right-of-use assets	82,690	85,538
Deposits and other assets	7,757	8,024
Deferred tax assets, net	18,139	19,409
Total assets	849,271	916,571
Current liabilities:
Accounts payable, accrued expenses, and operating lease liabilities	32,539	33,919
Accrued compensation and employee benefits	35,207	48,792
Deferred revenue and advance payments	184,891	187,107
Total current liabilities	252,637	269,818
Deferred revenue and advance payments	3,660	4,344
Operating lease liabilities	100,251	103,424
Other long-term liabilities	31,273	30,400
Deferred tax liabilities	24	26
Total liabilities	387,845	408,012
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	597,087	593,583
Treasury stock, at cost; 8,162 shares and 7,807 shares, respectively	(709,627)	(658,880)
Accumulated other comprehensive loss	(10,198)	(9,651)
Retained earnings	584,146	583,489
Total stockholders’ equity	461,426	508,559
Total liabilities and stockholders’ equity	849,271	916,571
Class A
Stockholders’ Equity
Common stock	16	16
Total stockholders’ equity	16	16
Class B Convertible
Stockholders’ Equity
Common stock	2	2
Total stockholders’ equity	$ 2	$ 2