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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income taxes      
Earnings before income tax $ 205,232 $ 235,888 $ 190,763
Statutory federal and provincial tax rate in British Columbia, Canada 27.00% 27.00% 27.00%
Expected income tax expense $ 55,413 $ 63,690 $ 51,506
Non-deductible expenses 7,854 4,732 3,705
Adjustments to prior years provision to statutory tax returns (1,826) (865) 4
Changes in the valuation of deferred tax assets (355) (2,027) (550)
Different tax rates of subsidiaries operating in foreign jurisdictions (6,257) (12,016) (11,818)
U.S. tax reform impacts 3,584 17,105 6,949
Change in enacted tax rates 121 391 (1,016)
Impairment of deferred tax asset from purchase price adjustment 947    
Unrecognized tax benefits (474) 817 (2,347)
Benefits of deductible stock options vested and exercised (2,121) (4,070) (1,780)
Deductions for tax purposes in excess of accounting expenses (2,709) (1,831) (287)
Other (799) (396) (2,743)
Income tax expense $ 53,378 $ 65,530 $ 41,623