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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