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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, 2016 $ 2,760,767 $ 937 $ 974,304 $ 1,785,526
Balance, Shares at Dec. 31, 2016   93,718    
Net income (loss) 320,372     320,372
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 23,276 $ 5 23,271  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   528    
Issuance of restricted stock   $ 5 (5)  
Issuance of restricted stock, shares   536    
Issuance of restricted stock for acquisition consideration 2,658 $ 1 2,657  
Issuance of restricted stock for acquisition consideration, shares   69    
Stock-based compensation expense 29,573   29,573  
Forfeitures of restricted stock   $ (1) 1  
Forfeitures of restricted stock, shares   (92)    
Repurchased common stock (70,192) $ (10) (12,473) (57,709)
Repurchased common stock, shares   (1,038)    
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   $ 8 (8)  
Issuance of restricted 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   $ 11 (11)  
Issuance of restricted stock, shares   1,113    
Stock-based compensation expense 42,758   42,758  
Stock swaps (689) $ 0 (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    
[1] Presented within retained earnings on both the Consolidated Balance Sheets and the Consolidated Statements of Equity as the balance is immaterial.