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Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Borrowings, by type [abstract]  
Summary of debt
December 31, 2020December 31, 2019
Senior secured notes due 2024, net of unamortized discount and transaction costs of $8,680 (2019 - $13,806)(Note 15 (a))
$226,647 $287,568 
Term loan, net of unamortized transaction costs of $1,491 (2019 - $2,239) (Note 15 (b))
131,842 197,761 
Revolving credit facility (Note 15 (b))
150,000 — 
Redemption option derivative asset (Note 15 (a))
(7,357)(5,597)
Total debt$501,132 $479,732 
Less: Current portion66,66766,667 
Non-current portion$434,465 $413,065 
Reconciliation of debt arising from financing activities
Reconciliation of debt arising from financing activities:
2020202020192019
Senior notes due 2024 and term loanRevolving credit facilitySenior notes due 2024 and term loan Senior notes due 2020
Balance beginning of year $479,732 $— $— $595,977 
Financing cash flows related to debt:
Redemption of Senior notes due 2024(66,047)— — — 
Scheduled repayment of term loan (66,667)— — — 
Proceeds from revolving credit facility— 150,000 — — 
Repayment of Senior notes due 2020— — — (600,000)
Proceeds from Senior secured notes due 2024, net of discount— — 294,000 — 
Proceeds from term loan— — 200,000 — 
Loan financing costs— — (15,583)— 
Total financing cash flows related to debt(132,714)150,000 478,417 (600,000)
$347,018 $150,000 $478,417 $(4,023)
Non-cash changes recorded in debt:
Amortization of discount and transaction costs of Senior notes due 2024 due to early redemption2,286 — — — 
Amortization of financing fees and discount relating to Senior notes due 2024 and term loan3,588 — 2,206 — 
Change in fair value of redemption option derivative asset relating to Senior secured notes due 2024(1,760)— (4,224)— 
Prepaid credit facility financing costs— — 3,333 — 
Amortization of deferred costs for Senior notes due 2020, and deferred costs expensed upon note redemption— — — 4,023 
Balance end of year$351,132 $150,000 $479,732 $—