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Consolidated Statements of Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2017 $ 3,066,454 $ 937 $ 1,017,328 $ 2,048,189
Balance, Shares at Dec. 31, 2017   93,721    
Net income (loss) 268,629     268,629
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 18,919 $ 5 18,914  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   495    
Issuance of restricted stock and conversion of restricted stock units to common stock   $ 8 (8)  
Issuance of restricted stock and conversion of restricted stock units to common stock, shares   770    
Stock-based compensation expense 38,703   38,703  
Stock swaps (2,661) $ (1) (2,660)  
Stock swaps, shares   (56)    
Forfeitures of restricted stock   $ (1) 1  
Forfeitures of restricted stock, shares   (69)    
Repurchased common stock (302,160) $ (70) (79,631) (222,459)
Repurchased common stock, shares   (7,041)    
Balance at Dec. 31, 2018 3,087,884 $ 878 992,647 2,094,359
Balance, Shares at Dec. 31, 2018   87,820    
Net income (loss) (1,497,702)     (1,497,702)
Unrealized holding gain on investments, net of tax [1] 78     78
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 11,947 $ 5 11,942  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   533    
Issuance of restricted stock and conversion of restricted stock units to common stock   $ 11 (11)  
Issuance of restricted stock and conversion of restricted stock units to common stock, shares   1,113    
Stock-based compensation expense 42,758   42,758  
Stock swaps (689)   (689)  
Stock swaps, shares   (20)    
Forfeitures of restricted stock   $ (1) 1  
Forfeitures of restricted stock, shares   (132)    
Repurchased common stock (145,280) $ (51) (58,706) (86,523)
Repurchased common stock, shares   (5,066)    
Balance at Dec. 31, 2019 1,498,996 $ 842 987,942 510,212
Balance, Shares at Dec. 31, 2019   84,248    
Net income (loss) (796,488)     (796,488)
Contribution from noncontrolling Interests, net of loss [1] 232     232
Unrealized holding gain on investments, net of tax [1] 3,452     3,452
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 7,009 $ 5 7,004  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   538    
Issuance of restricted stock and conversion of restricted stock units to common stock   $ 15 (15)  
Issuance of restricted stock and conversion of restricted stock units to common stock, shares   1,450    
Stock-based compensation expense 43,009   43,009  
Forfeitures of restricted stock   $ (2) 2  
Forfeitures of restricted stock, shares   (173)    
Repurchased common stock (8,493) $ (4) (8,489)  
Repurchased common stock, shares   (470)    
Balance at Dec. 31, 2020 $ 747,717 $ 856 $ 1,029,453 $ (282,592)
Balance, Shares at Dec. 31, 2020   85,593    
[1] Presented within retained (deficit) earnings as the balance is immaterial.