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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 152,155 $ 420,244
Restricted cash 1,025 938
Short-term investments 543,312 254,927
Accounts receivable, net 147,332 165,364
Prepaid expenses and other current assets 32,656 19,180
Total current assets 876,480 860,653
Property and equipment, net 53,414 53,359
Capitalized software development costs, net 1,000 2,499
Deposits and other assets 6,974 7,411
Deferred tax assets, net 12,041 9,297
Total assets 949,909 933,219
Current liabilities:    
Accounts payable and accrued expenses 25,688 30,711
Accrued compensation and employee benefits 34,343 41,498
Deferred revenue and advance payments 201,718 198,734
Total current liabilities 261,749 270,943
Deferred revenue and advance payments 5,668 6,400
Other long-term liabilities 68,906 50,146
Deferred tax liabilities 4 4
Total liabilities 336,327 327,493
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 564,661 559,918
Treasury stock, at cost; 6,405 shares (475,184) (475,184)
Accumulated other comprehensive loss (4,219) (5,659)
Retained earnings 528,306 526,633
Total stockholders' equity 613,582 605,726
Total liabilities and stockholders' equity 949,909 933,219
Class A    
Stockholders' Equity    
Common stock 16 16
Class B Convertible    
Stockholders' Equity    
Common stock $ 2 $ 2