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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 [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) 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      
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      
Net income (loss) (242,872)       (242,872)
Unrealized holding 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