Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Balance Type:	credit
Period Type:	instant

Note 7 - Debt, Credit Facility and Leases - Debt Summary (Details) - Senior Notes [Member] $ in Thousands, $ in Millions	Dec. 31, 2020 USD ($)	Jul. 09, 2020 CAD ($)	Dec. 31, 2019 USD ($)
Principal	$ 512,886
Unamortized discount/premium and issuance costs	(5,644)
Long-term debt balance	507,242
The 2028 Senior Notes [Member]
Principal	475,000
Unamortized discount/premium and issuance costs	(6,462)
Long-term debt balance	468,538
IQ Notes [Member]
Principal	37,886
Unamortized discount/premium and issuance costs	818
Long-term debt balance	$ 38,704	$ 48.2
The 2021 Senior Notes [Member]
Principal			$ 506,500
Unamortized discount/premium and issuance costs			(1,771)
Long-term debt balance			$ 504,729