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Income Taxes - Schedule of Effective Tax Rates (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Income tax benefit at combined statutory rates, Amount | $ 509 | $ 7,279 | $ 3,548 | $ 29,201
Unrealized investment gains not taxable, Amount |  | 420 |  |
Realized and unrealized investment gains (losses) not taxable, Amount |  |  | 1,367 | (239)
Increase of valuation allowance, Amount | (4,270) | (23,707) | (14,248) | (23,706)
Changes to tax reserves, Amount | (215) | (181) | 1,234 | (4,978)
Withholding taxes resulting from management's decision to no longer indefinitely reinvest the historical earnings of certain foreign subsidiaries, Amount |  | (186) | (547) | (18,661)
Reduction in tax benefits resulting from the vesting of share-based compensation | (4) | (38) | 709 | 33
Other non-deductible/non-taxable items, Amount | (422) | (2,936) | (1,479) | (6,256)
Income tax expense | $ (4,402) | $ (19,349) | $ (9,416) | $ (24,606)
Income tax benefit at combined statutory rates, Rate | 26.20% | 26.20% | 26.20% | 26.20%
Unrealized investment gains not taxable, Rate |  | 1.50% |  |
Realized and unrealized investment gains (losses) not taxable, Rate |  |  | 10.10% | (0.20%)
Increase of valuation allowance, Rate | (219.80%) | (85.30%) | (105.20%) | (21.30%)
Changes to tax reserves, Rate | (11.10%) | (0.70%) | 9.10% | (4.50%)
Withholding taxes resulting from management's decision to no longer indefinitely reinvest the historical earnings of certain foreign subsidiaries, Rate |  | (0.70%) | (4.00%) | (16.70%)
Reduction in tax benefits resulting from the vesting of share-based compensation | (0.20%) | (0.10%) | 5.20% |
Other non-deductible/non-taxable items, Rate | (21.70%) | (10.50%) | (10.90%) | (5.60%)
Income tax expense | (226.60%) | (69.60%) | (69.50%) | (22.10%)

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