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INCOME TAXES - Additional Tax Disclosures (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes |  |  |  |
Income tax expense recognized | $ 60,400 |  |  |
Accrued interest and penalties | 0 | $ 0 |  |
Uncertain Tax Positions |  |  |  |
Unrecognized tax benefits | 15,185 | 15,342 | $ 15,413 | $ 15,488
Gross decrease in tax portions from prior years |  | $ (71) | $ (75) |
Gross decrease in tax portions from current year | (157) |  |  |
Unrecognized tax benefits would affect the effective income tax rate if recognized | 8,000 |  |  |
Federal |  |  |  |
Income Taxes |  |  |  |
Net operating loss carryforwards | 400,000 |  |  |
Net operating loss carryforwards, indefinite period | 2,000 |  |  |
Tax credit carryforward amount | 43,600 |  |  |
State |  |  |  |
Income Taxes |  |  |  |
Net operating loss carryforwards | 650,700 |  |  |
State | Research and development |  |  |  |
Income Taxes |  |  |  |
Tax credit carryforward amount | $ 32,200 |  |  |

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