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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, 2018 $ 3,087,884 $ 878 $ 992,647 $ 2,094,359
Balance, Shares at Dec. 31, 2018   87,820    
Net loss (242,872)     (242,872)
Unrealized holding loss on investments, net of tax [1] (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    
Stock-based compensation expense 11,100   11,100  
Stock swaps (666)   (666)  
Stock swaps, shares   (20)    
Forfeitures of restricted stock, shares   (6)    
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 1,801,076
Balance, Shares at Mar. 31, 2019   86,387    
Balance at Dec. 31, 2019 1,498,996 $ 842 987,942 510,212
Balance, Shares at Dec. 31, 2019   84,248    
Net loss (18,712)     (18,712)
Unrealized holding loss on investments, net of tax [1] (213)     (213)
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,832 $ 1 1,831  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   78    
Issuance of restricted stock   $ 10 (10)  
Issuance of restricted stock, shares   968    
Stock-based compensation expense 8,035   8,035  
Forfeitures of restricted stock, shares   (19)    
Repurchased common stock (2,542) $ (1) (2,541) 0
Repurchased common stock, shares   (125)    
Balance at Mar. 31, 2020 $ 1,487,396 $ 852 $ 995,257 $ 491,287
Balance, Shares at Mar. 31, 2020   85,150    
[1] Presented within retained earnings on the consolidated balance sheet as the balance is immaterial.