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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 gain (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 and conversion of restricted stock units to common stock   $ 10 (10)  
Issuance of restricted stock and conversion of restricted stock units to common 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, 2018 3,087,884 $ 878 992,647 2,094,359
Balance, Shares at Dec. 31, 2018   87,820    
Net loss (251,117)      
Balance at Jun. 30, 2019 2,725,027 $ 841 967,429 1,756,757
Balance, Shares at Jun. 30, 2019   84,096    
Balance at Mar. 31, 2019 2,779,812 $ 864 977,872 1,801,076
Balance, Shares at Mar. 31, 2019   86,387    
Net 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 and conversion of restricted stock units to common stock   $ 1 (1)  
Issuance of restricted stock and conversion of restricted stock units to common stock, shares   123    
Stock-based compensation expense 15,080   15,080  
Forfeitures of restricted stock   $ (1) 1  
Forfeitures of restricted stock, shares   (61)    
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 1,756,757
Balance, Shares at Jun. 30, 2019   84,096    
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 gain (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 and conversion of restricted stock units to common stock   $ 10 (10)  
Issuance of restricted stock and conversion of restricted stock units to common 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    
Balance at Dec. 31, 2019 1,498,996 $ 842 987,942 510,212
Balance, Shares at Dec. 31, 2019   84,248    
Net loss (691,148)      
Balance at Jun. 30, 2020 826,570 $ 855 1,004,786 (179,071)
Balance, Shares at Jun. 30, 2020   85,536    
Balance at Mar. 31, 2020 1,487,396 $ 852 995,257 491,287
Balance, Shares at Mar. 31, 2020   85,150    
Net loss (672,436)     (672,436)
Unrealized holding gain (loss) on investments, net of tax 2,078     2,078
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 2,544 $ 3 2,541  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   277    
Issuance of restricted stock and conversion of restricted stock units to common stock   $ 2 (2)  
Issuance of restricted stock and conversion of restricted stock units to common stock, shares   200    
Stock-based compensation expense 7,489   7,489  
Forfeitures of restricted stock   $ (1) 1  
Forfeitures of restricted stock, shares   (57)    
Repurchased common stock (501) $ (1) (500) 0
Repurchased common stock, shares   (34)    
Balance at Jun. 30, 2020 $ 826,570 $ 855 $ 1,004,786 $ (179,071)
Balance, Shares at Jun. 30, 2020   85,536    
[1] Presented within retained earnings on the consolidated balance sheet as the balance is immaterial.