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Condensed Consolidated Statements of Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
 [1]
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) 63,428       63,428
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 4,027 $ 1 4,026    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   97      
Issuance of restricted stock   $ 6 (6)    
Issuance of restricted stock, shares   588      
Forfeitures of restricted stock, shares   (13)      
Stock swaps (296)   (296)    
Stock swaps, shares   (5)      
Stock-based compensation expense 9,875   9,875    
Balance at Mar. 31, 2018 3,143,488 $ 944 1,030,927   2,111,617
Balance, Shares at Mar. 31, 2018   94,388      
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) 208,415        
Balance at Sep. 30, 2018 3,015,305 $ 893 998,670   2,015,742
Balance, Shares at Sep. 30, 2018   89,349      
Balance at Dec. 31, 2017 3,066,454 $ 937 1,017,328   2,048,189
Balance, Shares at Dec. 31, 2017   93,721      
Repurchased common stock (250,000)        
Balance at Dec. 31, 2018 3,087,884 $ 878 992,647   2,094,359
Balance, Shares at Dec. 31, 2018   87,820      
Balance at Mar. 31, 2018 3,143,488 $ 944 1,030,927   2,111,617
Balance, Shares at Mar. 31, 2018   94,388      
Net income (loss) 79,412       79,412
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 8,023 $ 2 8,021    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   214      
Issuance of restricted stock, shares   9      
Forfeitures of restricted stock, shares   (32)      
Stock swaps (2,365)   (2,365)    
Stock swaps, shares   (50)      
Stock-based compensation expense 10,524   10,524    
Repurchased common stock (52,160) $ (12) (14,534)   (37,614)
Repurchased common stock, shares   (1,155)      
Balance at Jun. 30, 2018 3,186,922 $ 934 1,032,573   2,153,415
Balance, Shares at Jun. 30, 2018   93,374      
Net income (loss) 65,575       65,575
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 3,863 $ 1 3,862    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   108      
Issuance of restricted stock, shares   104      
Forfeitures of restricted stock, shares   (13)      
Stock-based compensation expense 8,945   8,945    
Repurchased common stock (250,000) $ (42) (46,710)   (203,248)
Repurchased common stock, shares   (4,224)      
Balance at Sep. 30, 2018 3,015,305 $ 893 998,670   2,015,742
Balance, Shares at Sep. 30, 2018   89,349      
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) (242,872)       (242,872)
Unrealized holding gain (loss) on investments, net of tax (194)     $ (194)  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 3,542 $ 1 3,541    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   140      
Issuance of restricted stock   $ 10 (10)    
Issuance of restricted stock, shares   978      
Forfeitures of restricted stock, shares   (6)      
Stock swaps (666)   (666)    
Stock swaps, shares   (20)      
Stock-based compensation expense 11,100   11,100    
Repurchased common stock (78,982) $ (25) (28,740)   (50,217)
Repurchased common stock, shares   (2,525)      
Balance at Mar. 31, 2019 2,779,812 $ 864 977,872 (194) 1,801,270
Balance, Shares at Mar. 31, 2019   86,387      
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) (1,507,033)        
Repurchased common stock (144,900)        
Repurchased common stock, shares   (5,100)      
Balance at Sep. 30, 2019 1,479,360 $ 842 977,709 6 500,803
Balance, Shares at Sep. 30, 2019   84,185      
Balance at Mar. 31, 2019 2,779,812 $ 864 977,872 (194) 1,801,270
Balance, Shares at Mar. 31, 2019   86,387      
Net income (loss) (8,245)       (8,245)
Unrealized holding gain (loss) on investments, net of tax 232     232  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 3,675 $ 2 3,673    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   155      
Issuance of restricted stock   $ 1 (1)    
Issuance of restricted stock, shares   123      
Forfeitures of restricted stock   $ (1) 1    
Forfeitures of restricted stock, shares   (61)      
Stock-based compensation expense 15,080   15,080    
Repurchased common stock (65,527) $ (25) (29,196)   (36,306)
Repurchased common stock, shares   (2,508)      
Balance at Jun. 30, 2019 2,725,027 $ 841 967,429 38 1,756,719
Balance, Shares at Jun. 30, 2019   84,096      
Net income (loss) (1,255,916)       (1,255,916)
Unrealized holding gain (loss) on investments, net of tax (32)     (32)  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 2,606 $ 1 2,605    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   124      
Issuance of restricted stock, shares   12      
Forfeitures of restricted stock, shares   (27)      
Stock-based compensation expense 8,090   8,090    
Repurchased common stock (415)   (415)    
Repurchased common stock, shares   (20)      
Balance at Sep. 30, 2019 $ 1,479,360 $ 842 $ 977,709 $ 6 $ 500,803
Balance, Shares at Sep. 30, 2019   84,185      
[1] Presented within retained earnings on the consolidated balance sheet as the balance is immaterial.