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Consolidated Statements of Equity (Unaudited) - USD ($)
$ 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   84,248,000      
Net income (loss) (18,712)       (18,712) [1]
Unrealized holding gain (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   78,000      
Issuance of restricted stock   $ 10 (10)    
Issuance of restricted stock, shares   968,000      
Forfeitures of restricted stock, shares   (19,000)      
Stock-based compensation expense 8,035   8,035    
Repurchased common stock (2,542) $ (1) (2,541)    
Repurchased common stock, shares   (125,000)      
Balance at Mar. 31, 2020 1,487,396 $ 852 995,257 (135) 491,422 [1]
Balance, Shares at Mar. 31, 2020   85,150,000      
Balance at Dec. 31, 2019 1,498,996 $ 842 987,942 78 510,134 [1]
Balance, Shares at Dec. 31, 2019   84,248,000      
Net income (loss) (732,192)        
Net loss attributable to noncontrolling interest        
Balance at Sep. 30, 2020 805,006 $ 855 1,023,974 1,990 (221,813) [1]
Balance, Shares at Sep. 30, 2020   85,504,000      
Balance at Mar. 31, 2020 1,487,396 $ 852 995,257 (135) 491,422 [1]
Balance, Shares at Mar. 31, 2020   85,150,000      
Net income (loss) (672,436)       (672,436) [1]
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   277,000      
Issuance of restricted stock   $ 2 (2)    
Issuance of restricted stock, shares   200,000      
Forfeitures of restricted stock   $ (1) 1    
Forfeitures of restricted stock, shares   (57,000)      
Stock-based compensation expense 7,489   7,489    
Repurchased common stock (501) $ (1) (500)    
Repurchased common stock, shares   (34,000)      
Balance at Jun. 30, 2020 826,570 $ 855 1,004,786 1,943 (181,014) [1]
Balance, Shares at Jun. 30, 2020   85,536,000      
Net income (loss) (41,044)       (41,044) [1]
Net loss attributable to noncontrolling interest        
Contribution from noncontrolling interests [1] 245       245
Unrealized holding gain (loss) on investments, net of tax 47     47  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,324 $ 1 1,323    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   89,000      
Issuance of restricted stock   $ 3 (3)    
Issuance of restricted stock, shares   282,000      
Forfeitures of restricted stock   $ (1) 1    
Forfeitures of restricted stock, shares   (92,000)      
Stock-based compensation expense 23,316   23,316    
Repurchased common stock (5,452) $ (3) (5,449)    
Repurchased common stock, shares   (311,000)      
Balance at Sep. 30, 2020 805,006 $ 855 1,023,974 1,990 (221,813) [1]
Balance, Shares at Sep. 30, 2020   85,504,000      
Balance at Dec. 31, 2020 747,717 $ 856 1,029,453 3,530 (286,122) [1]
Balance, Shares at Dec. 31, 2020   85,593,000      
Net income (loss) 17,642       17,642 [1]
Net loss attributable to noncontrolling interest [1] (8)       (8)
Unrealized holding gain (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   52,000      
Issuance of restricted stock   $ 7 (7)    
Issuance of restricted stock, shares   660,000      
Forfeitures of restricted stock, shares   (13,000)      
Stock-based compensation expense 3,717   3,717    
Repurchased common stock (1,994) $ (1) (1,993)    
Repurchased common stock, shares   (82,000)      
Balance at Mar. 31, 2021 766,983 $ 862 1,032,212 2,397 (268,488) [1]
Balance, Shares at Mar. 31, 2021   86,210,000      
Balance at Dec. 31, 2020 747,717 $ 856 1,029,453 3,530 (286,122) [1]
Balance, Shares at Dec. 31, 2020   85,593,000      
Net income (loss) 83,448        
Net loss attributable to noncontrolling interest $ (21)        
Repurchased common stock, shares 0        
Balance at Sep. 30, 2021 $ 845,677 $ 864 1,045,285 2,223 (202,695) [1]
Balance, Shares at Sep. 30, 2021   86,402,000      
Balance at Mar. 31, 2021 766,983 $ 862 1,032,212 2,397 (268,488) [1]
Balance, Shares at Mar. 31, 2021   86,210,000      
Net income (loss) 35,011       35,011 [1]
Net loss attributable to noncontrolling interest (6)       (6) [1]
Unrealized holding gain (loss) on investments, net of tax 116     116  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 1,536 $ 1 1,535    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   71,000      
Issuance of restricted stock   $ 1 (1)    
Issuance of restricted stock, shares   69,000      
Forfeitures of restricted stock   $ (1) 1    
Forfeitures of restricted stock, shares   (5,000)      
Stock-based compensation expense 5,735   5,735    
Repurchased common stock (251)   (251)    
Repurchased common stock, shares   (8,000)      
Balance at Jun. 30, 2021 809,124 $ 863 1,039,231 2,513 (233,483) [1]
Balance, Shares at Jun. 30, 2021   86,337,000      
Net income (loss) 30,795       30,795 [1]
Net loss attributable to noncontrolling interest (7)       (7) [1]
Unrealized holding gain (loss) on investments, net of tax 290     290  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 3,034 $ 2 3,032    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   148,000      
Stock-based compensation expense 5,495   5,495    
Repurchased common stock (2,474) $ (1) (2,473)    
Repurchased common stock, shares   (83,000)      
Balance at Sep. 30, 2021 $ 845,677 $ 864 $ 1,045,285 $ 2,223 $ (202,695) [1]
Balance, Shares at Sep. 30, 2021   86,402,000      
[1] Presented within retained earnings on the consolidated balance sheet as the balance is immaterial.