Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Earnings before income tax	$ 282,400	$ 406,000	$ 205,300
Statutory federal and provincial tax rate in British Columbia, Canada	27.00%	27.00%	27.00%
Expected income tax expense	$ 76,200	$ 109,600	$ 55,400
Different tax rates of subsidiaries operating in foreign jurisdictions	(3,700)	(6,400)	(6,300)
Non-deductible expenses	11,100	7,700	6,300
Executive compensation and fringe benefits	5,000	300	1,600
Non-taxable gain on capital items	(400)	(19,400)	(300)
U.S. tax reform impacts	(6,900)	0	3,600
Changes in the valuation of deferred tax assets	300	(1,600)	(300)
Unrecognized tax benefits	2,000	(1,500)	(500)
Equity compensation	(3,900)	(2,300)	(4,800)
Revaluation of opening US deferred liability	(1,400)	0	0
Other	(1,900)	(200)	(1,300)
Income tax expense	$ 76,400	$ 86,200	$ 53,400