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Net corporate and other expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Income and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Corporate expenses |  |  |  |  |  |  |  |  | $ 39,765 | $ 30,397 | $ 17,606
Investment expense (income) on deposit liabilities |  |  |  |  |  |  |  |  | 852 | 5,879 | (1,273)
Current expected credit losses |  |  |  |  |  |  |  |  | 624 | 0 | 0
Change in fair value of embedded derivatives in reinsurance contracts |  |  |  |  |  |  |  |  | (26) | 9 | (149)
Net corporate and other expenses | $ 10,957 | $ 14,965 | $ 8,878 | $ 6,415 | $ 8,033 | $ 7,009 | $ 13,825 | $ 7,418 | $ 41,215 | $ 36,285 | $ 16,184

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