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Income Taxes (Summary of Income Tax Expense (Recovery)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income taxes      
Canadian, Current tax expense $ 21,664 $ 27,766 $ 19,752
Canadian, Deferred tax expense (recovery) 5,639 3,970 3,346
Current tax expense before application of operating loss carryforwards 30,093 30,280 24,815
Tax benefit of operating loss carryforwards (2,238) (1,668) (11,770)
Total foreign current tax expense 27,855 28,612 13,045
Deferred tax expense before adjustment to opening valuation allowance (1,781) 6,127 5,727
Adjustment to opening valuation allowance 1 (945) (247)
Total foreign deferred tax expense (recovery) (1,780) 5,182 5,480
Income tax expense $ 53,378 $ 65,530 $ 41,623