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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (in thousands, except share data and dividends per share) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Cash dividends per share $ 0.10        
Balances, Common Stock, Shares, Outstanding, Beginning at Dec. 31, 2017   111,687,016      
Balances, Total Stockholders' Equity, Beginning at Dec. 31, 2017 $ 2,394,608 $ 1,117 $ 1,741,623 $ 665,657 $ (13,789)
Increase (Decrease) in Stockholders' Equity          
Net income (loss) 508,407     508,407  
Other comprehensive income (loss) 4,378       4,378
Cash dividends (11,191)     (11,191)  
Issuance of common stock under Employee Stock Purchase Plan (Shares)   199,464      
Issuance of common stock under Employee Stock Purchase Plan (Amount) 3,187 $ 2 3,185    
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Shares)   291,745      
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Amount) (2,975) $ 3 (2,978)    
Stock-based compensation expense (Shares)   63,741      
Stock-based compensation expense (Amount) 23,908 $ 0 23,908    
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2018   112,241,966      
Balances, Total Stockholders' Equity, Ending at Dec. 31, 2018 $ 2,920,322 $ 1,122 1,765,738 1,165,842 (12,380)
Cash dividends per share $ 0.10        
Increase (Decrease) in Stockholders' Equity          
Net income (loss) $ (187,001)     (187,001)  
Other comprehensive income (loss) 1,061       1,061
Cash dividends (11,254)     (11,254)  
Issuance of common stock under Employee Stock Purchase Plan (Shares)   314,868      
Issuance of common stock under Employee Stock Purchase Plan (Amount) 3,209 $ 3 3,206    
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Shares)   334,399      
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Amount) (1,661) $ 4 (1,665)    
Stock-based compensation expense (Shares)   96,719      
Stock-based compensation expense (Amount) $ 24,318 $ 1 24,317    
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2019 112,987,952 112,987,952      
Balances, Total Stockholders' Equity, Ending at Dec. 31, 2019 $ 2,748,994 $ 1,130 1,791,596 967,587 (11,319)
Cash dividends per share $ 0.02        
Increase (Decrease) in Stockholders' Equity          
Net income (loss) $ (764,614)     (764,614)  
Other comprehensive income (loss) (2,279)       (2,279)
Cash dividends (2,276)     (2,276)  
Issuance of common stock under Employee Stock Purchase Plan (Shares)   464,757      
Issuance of common stock under Employee Stock Purchase Plan (Amount) 1,464 $ 4 1,460    
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Shares)   1,022,019      
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Amount) (1,560) $ 10 (1,570)    
Stock-based compensation expense (Shares)   267,576      
Stock-based compensation expense (Amount) 14,999 $ 3 14,996    
Issuance of warrants 21,520   21,520    
Other $ (88)   (88)    
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2020 114,742,304 114,742,304      
Balances, Total Stockholders' Equity, Ending at Dec. 31, 2020 $ 2,016,160 $ 1,147 $ 1,827,914 $ 200,697 $ (13,598)