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Deposit accounted contracts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deposit Contracts, Liabilities [Roll Forward]      
Balance, beginning of year $ 172,259 $ 145,342 $ 129,133
Consideration received 550 23,884 17,879
Consideration receivable 0 10,164 7,390
Net investment expense (income) allocation 852 5,879 (1,273)
Payments (20,752) (13,052) (8,089)
Foreign currency translation 52 42 302
Balance, end of year $ 152,961 $ 172,259 $ 145,342