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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Class A Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2017   51,136      
Beginning balance at Dec. 31, 2017 $ 764,550 $ 51 $ 354,789 $ 410,440 $ (730)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock issued under stock plans, net of withholdings and related tax effects (in shares)   1,528      
Common stock issued under stock plans, net of withholdings and related tax effects (14,057) $ 2 (14,059)    
Stock-based compensation 37,373   37,373    
Net (loss) income 104,431     104,431  
Other comprehensive income (567)       (567)
Ending balance (in shares) at Sep. 30, 2018   52,664      
Ending balance at Sep. 30, 2018 891,730 $ 53 378,103 514,871 (1,297)
Beginning balance (in shares) at Jun. 30, 2018   52,390      
Beginning balance at Jun. 30, 2018 876,713 $ 52 367,454 510,298 (1,091)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock issued under stock plans, net of withholdings and related tax effects (in shares)   274      
Common stock issued under stock plans, net of withholdings and related tax effects (6,121) $ 1 (6,122)    
Stock-based compensation 16,771   16,771    
Net (loss) income 4,573     4,573  
Other comprehensive income (206)       (206)
Ending balance (in shares) at Sep. 30, 2018   52,664      
Ending balance at Sep. 30, 2018 891,730 $ 53 378,103 514,871 (1,297)
Beginning balance (in shares) at Dec. 31, 2018   52,917      
Beginning balance at Dec. 31, 2018 909,812 $ 53 380,753 529,143 (137)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock issued under stock plans, net of withholdings and related tax effects (in shares)   634      
Common stock issued under stock plans, net of withholdings and related tax effects (13,297) $ 1 (13,298)    
Stock-based compensation 30,136   30,136    
Repurchases of Class A common stock (in shares)   (2,072)      
Repurchases of Class A common stock (100,000) $ (2) (99,998)    
Net (loss) income 98,204     98,204  
Other comprehensive income 2,329       2,329
Ending balance (in shares) at Sep. 30, 2019   51,479      
Ending balance at Sep. 30, 2019 927,184 $ 52 297,593 627,347 2,192
Beginning balance (in shares) at Jun. 30, 2019   51,809      
Beginning balance at Jun. 30, 2019 921,913 $ 52 291,958 627,878 2,025
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock issued under stock plans, net of withholdings and related tax effects (in shares)   76      
Common stock issued under stock plans, net of withholdings and related tax effects (1,259)   (1,259)    
Stock-based compensation 6,894   6,894    
Repurchases of Class A common stock (in shares)   (406)      
Repurchases of Class A common stock 0        
Net (loss) income (531)     (531)  
Other comprehensive income 167       167
Ending balance (in shares) at Sep. 30, 2019   51,479      
Ending balance at Sep. 30, 2019 $ 927,184 $ 52 $ 297,593 $ 627,347 $ 2,192