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Income taxes - Reconciliation of Expected Income Taxes to Income Tax Expense (Benefit) (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
Operating Loss Carryforwards [Line Items]                      
Withholding taxes related to dividend and interest income                 $ 0 $ 0 $ 6,325
Uncertain tax positions                 68 0 (300)
Non-deductible expenses and other                 (4) 10 (1)
Income Tax Expense (Benefit) $ 3,728 $ 652 $ 3,309 $ 419 $ (718) $ (213) $ (74) $ 1,718 8,108 713 (4,010)
Bermuda                      
Operating Loss Carryforwards [Line Items]                      
Bermuda (expected tax expense at 0%)                 0 0 0
United States                      
Operating Loss Carryforwards [Line Items]                      
Foreign location                 8,013 681 (10,032)
United Kingdom                      
Operating Loss Carryforwards [Line Items]                      
Foreign location                 $ 31 $ 22 $ (2)