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Income Taxes (Summary of Income Tax Expense (Recovery)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes      
Canadian, Current tax expense $ 60,897 $ 21,664 $ 27,766
Canadian, Deferred tax expense 2,725 5,639 3,970
Current tax expense before application of operating loss carryforwards 29,573 30,093 30,280
Tax benefit of operating loss carryforwards (3,987) (2,238) (1,668)
Total current tax expense 25,586 27,855 28,612
Deferred tax expense before adjustment to opening valuation allowance (2,978) (1,781) 6,127
Adjustment to opening valuation allowance   1 (945)
Total deferred tax (recovery) expense (2,978) (1,780) 5,182
Income tax expense $ 86,230 $ 53,378 $ 65,530