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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 |  |  |  |  |  |  |  |  |

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