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Income Taxes - Components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss | $ 67,142 | $ 30,836
Uncrystallized losses | 2,926 | 1,565
AMT credit carryforward | 0 | 1,323
Discounting of net loss reserves | 74,247 | 52,582
Net unearned premium reserve | 66,368 | 64,269
Compensation liabilities | 27,351 | 21,693
Foreign tax credit carryforward | 19,160 | 9,521
Interest expense | 622 | 0
Goodwill and intangible assets | 14,450 | 11,644
Bad debt reserves | 1,864 | 5,983
Lease liability | 23,604 | 26,438
Net unrealized foreign exchange gains | 165 | 598
Other, net | 1,725 | 206
Deferred tax assets before valuation allowance | 299,624 | 226,658
Valuation allowance | (88,255) | (48,219)
Deferred tax assets net of valuation allowance | 211,369 | 178,439
Deferred income tax liabilities: |  |
Depreciation and amortization | (495) | (1,215)
Deposit accounting liability | (1,751) | (2,169)
Contingency reserve | (64,593) | (132,831)
Deferred policy acquisition costs | (42,045) | (29,847)
Net unrealized appreciation of investments | (66,681) | (38,764)
Right-of-use asset | (19,239) | (23,416)
Other, net | (843) | (3,680)
Total deferred tax liabilities | (195,647) | (231,922)
Net deferred income tax assets | $ 15,722 |
Net deferred income tax liabilities |  | $ 53,483

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