Long-Term Debt - Loan Facility (Details) - Loan Facility	Nov. 04, 2020 CAD ($) draw	Dec. 31, 2021 USD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CAD ($)
Line of Credit Facility [Line Items]
Maximum borrowing capacity of credit facility	$ 220,000,000	$ 174,000,000
Maximum borrowing capacity, proportion representing countervailing and anti-dumping duty deposits (as a percent)	75.00%
Period of repayment in consecutive monthly installments	8 years
Interest-only payment period	2 years
Number of draws available	10
Fee rate paid for draw (as a percent)	0.50%
Available credit facility borrowing capacity		$ 174,000,000	$ 220,000,000	$ 130,000,000	$ 165,000,000
Canadian Banker's Acceptance Rate
Line of Credit Facility [Line Items]
Interest rate margin applicable to borrowings (as a percent)	1.45%