Long-Term Debt (Details of the Company's Credit Agreement) (Details) - Credit Agreement [Member] - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2022	Dec. 31, 2021
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Available		$ 1,069,127	$ 933,775
Amount drawn	[1]	$ 738,165	$ 803,944
Commitment - rate applicable		0.09%	0.09%
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Letter of credit		$ 42,708	$ 112,281
LIBOR [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Amount drawn		$ 601,000	$ 631,000
Interest rate applicable		4.12%	1.10%
LIBOR [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Amount drawn		$ 650,000	$ 650,000
Interest rate applicable		4.12%	1.10%
Base Rate [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Amount drawn		$ 0	$ 158,000
Interest rate applicable		0.00%	3.25%
US Swing Line Loan [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Amount drawn		$ 0	$ 11,000
Interest rate applicable		0.00%	3.25%
Canadian Bankers Acceptance Loan [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Amount drawn		$ 137,165	$ 3,944
Interest rate applicable		4.76%	1.45%

[1] Interest rates represent the interest rates in effect at September 30, 2022