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Consolidated Statements of Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Deficit [Member]
Balance at Dec. 31, 2019 $ 1,498,996 $ 842 $ 987,942 $ 78 $ 510,134 [1]
Balance, Shares at Dec. 31, 2019   84,248      
Net income (loss) (18,712)       (18,712) [1]
Unrealized holding loss on investments, net of tax (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      
Forfeitures of restricted stock, shares   (19)      
Stock-based compensation expense 8,035   8,035    
Repurchased common stock (2,542) $ (1) (2,541)    
Repurchased common stock, shares   (125)      
Balance at Mar. 31, 2020 1,487,396 $ 852 995,257 (135) 491,422 [1]
Balance, Shares at Mar. 31, 2020   85,150      
Balance at Dec. 31, 2020 747,717 $ 856 1,029,453 3,530 (286,122) [1]
Balance, Shares at Dec. 31, 2020   85,593      
Net income (loss) 17,642       17,642
Contribution from noncontrolling interests, net of loss (8) [1]       (8)
Unrealized holding loss on investments, net of tax (1,133)     (1,133)  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,042   1,042    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   52      
Issuance of restricted stock   $ 7 (7)    
Issuance of restricted stock, shares   660      
Forfeitures of restricted stock, shares   (13)      
Stock-based compensation expense 3,717   3,717    
Repurchased common stock (1,994) $ (1) (1,993)    
Repurchased common stock, shares   (82)      
Balance at Mar. 31, 2021 $ 766,983 $ 862 $ 1,032,212 $ 2,397 $ (268,488) [1]
Balance, Shares at Mar. 31, 2021   86,210      
[1] Noncontrolling interest in 2021 is presented within retained deficit as the balance is immaterial.