Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes
Earnings before income tax	$ 405,988	$ 205,232	$ 235,888
Statutory federal and provincial tax rate in British Columbia, Canada	27.00%	27.00%	27.00%
Expected income tax expense	$ 109,617	$ 55,413	$ 63,690
Non-deductible expenses	7,978	7,853	4,732
Non-taxable gain on capital items	(19,457)	(265)	(60)
Changes in the valuation of deferred tax assets	(2,302)	(355)	(2,027)
Different tax rates of subsidiaries operating in foreign jurisdictions	(6,394)	(6,257)	(12,016)
U.S. tax reform impacts	7	3,584	17,105
Income (deductions) for tax purposes in excess of accounting expenses	(754)	(2,698)	(1,566)
Unrecognized tax benefits	(1,476)	(474)	817
Benefits of deductible stock options	(1,518)	(2,121)	(4,070)
Expired losses with full valuation allowance	689	620	725
Other	(160)	(1,922)	(1,800)
Income tax expense	$ 86,230	$ 53,378	$ 65,530