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Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Current assets    
Cash and cash equivalents $ 245,639 $ 387,149
Marketable securities 963,093 891,914
Accounts receivable, net of allowance 282,407 354,965
Prepaid expenses and other current assets 41,701 41,900
Total current assets 1,532,840 1,675,928
Property and equipment, net 195,302 212,560
Operating lease right-of-use assets 284,486  
Intangible assets, net 115,386 126,054
Goodwill 629,596 632,370
Other assets 68,133 67,194
Total assets 2,825,743 2,714,106
Current liabilities    
Accounts payable 31,827 30,876
Operating lease liabilities 46,078  
Accrued expenses and other current liabilities 244,999 261,815
Total current liabilities 322,904 292,691
Operating lease liabilities, noncurrent 329,293  
Other liabilities 7,669 110,416
Total liabilities 659,866 403,107
Commitments and contingencies (Note 6)
Stockholders’ equity    
Additional paid-in capital 8,388,608 8,220,417
Accumulated other comprehensive income (68) 3,147
Accumulated deficit (6,222,677) (5,912,578)
Total stockholders’ equity 2,165,877 2,310,999
Total liabilities and stockholders’ equity 2,825,743 2,714,106
Class A Non-voting Common Stock    
Stockholders’ equity    
Common stock, value 11 10
Class B Voting Common Stock    
Stockholders’ equity    
Common stock, value 1 1
Class C Voting Common Stock    
Stockholders’ equity    
Common stock, value $ 2 $ 2