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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Common Stock [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Deficit [Member]
Accumulated Deficit [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Noncontrolling Interests [Member]
Noncontrolling Interests [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at Dec. 31, 2018 $ 528,470   $ 854   $ 1,226,453   $ (2,281)   $ (715,827)   $ 19,271  
Balance (ASU 2016-02 [Member]) at Dec. 31, 2018   $ 8,688   $ 0   $ 0   $ 0   $ 8,688   $ 0
Balance (ASU 2018-02 [Member]) at Dec. 31, 2018   $ 0   $ 0   $ 0   $ 611   $ (611)   $ 0
Balance, Shares at Dec. 31, 2018     85,432,102                  
Net income (loss) 70,592   $ 0   0   0   70,592   0  
Change in unrealized gain or loss on investments 1,097   0   0   1,097   0   0  
Foreign currency translation adjustments 111   0   0   111   0   0  
Shares issued from stock plans, net of payroll taxes paid 5,272   $ 14   5,258   0   0   0  
Shares issued from stock plans, net of payroll taxes paid, Shares     1,414,970                  
Stock-based compensation 34,072   $ 0   34,072   0   0   0  
Balance at Jun. 30, 2019 648,302   $ 868   1,265,783   (462)   (637,158)   19,271  
Balance, Shares at Jun. 30, 2019     86,847,072                  
Balance at Mar. 31, 2019 508,494   $ 861   1,242,460   (937)   (753,161)   19,271  
Balance, Shares at Mar. 31, 2019     86,129,564                  
Net income (loss) 116,003   $ 0   0   0   116,003   0  
Change in unrealized gain or loss on investments 655   0   0   655   0   0  
Foreign currency translation adjustments (180)   0   0   (180)   0   0  
Shares issued from stock plans, net of payroll taxes paid 5,688   $ 7   5,681   0   0   0  
Shares issued from stock plans, net of payroll taxes paid, Shares     717,508                  
Stock-based compensation 17,642   $ 0   17,642   0   0   0  
Balance at Jun. 30, 2019 648,302   $ 868   1,265,783   (462)   (637,158)   19,271  
Balance, Shares at Jun. 30, 2019     86,847,072                  
Balance at Dec. 31, 2019 535,406   $ 877   1,300,725   (747)   (784,720)   19,271  
Balance, Shares at Dec. 31, 2019     87,657,489                  
Net income (loss) (163,661)   $ 0   0   0   (163,661)   0  
Change in unrealized gain or loss on investments 520   0   0   520   0   0  
Foreign currency translation adjustments (1,334)   0   0   (1,334)   0   0  
Shares issued from stock plans, net of payroll taxes paid 9,652   $ 25   9,627   0   0   0  
Shares issued from stock plans, net of payroll taxes paid, Shares     2,570,804                  
Stock-based compensation 34,560   $ 0   34,560   0   0   0  
Balance at Jun. 30, 2020 415,143   $ 902   1,344,912   (1,561)   (948,381)   19,271  
Balance, Shares at Jun. 30, 2020     90,228,293                  
Balance at Mar. 31, 2020 477,629   $ 889   1,319,354   1,183   (863,068)   19,271  
Balance, Shares at Mar. 31, 2020     88,895,630                  
Net income (loss) (85,313)   $ 0   0   0   (85,313)   0  
Change in unrealized gain or loss on investments (1,129)   0   0   (1,129)   0   0  
Foreign currency translation adjustments (1,615)   0   0   (1,615)   0   0  
Shares issued from stock plans, net of payroll taxes paid 7,927   $ 13   7,914   0   0   0  
Shares issued from stock plans, net of payroll taxes paid, Shares     1,332,663                  
Stock-based compensation 17,644   $ 0   17,644   0   0   0  
Balance at Jun. 30, 2020 $ 415,143   $ 902   $ 1,344,912   $ (1,561)   $ (948,381)   $ 19,271  
Balance, Shares at Jun. 30, 2020     90,228,293