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Income Taxes (Details 6) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of the beginning and ending amounts of unrecognized income tax benefits |  |  |
Balance at the beginning of the period | $ 115,653 | $ 23,482 | $ 22,652
Tax positions related to current year: |  |  |
Additions | 18,600 | 16,485 | 1,032
Tax positions related to prior years: |  |  |
Additions | 0 | 76,158 | 115
Reductions | (209) | (472) | (317)
Settlements | 0 | 0 | 0
Balance at the end of the period | $ 134,044 | $ 115,653 | $ 23,482

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