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Debt - Credit Facility (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jan. 26, 2022
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]          
Proceeds from credit facility (note 17(a))       $ 65,000 $ 40,000
Repayment for credit facility       55,000  
Term Credit Facility [member]          
Disclosure of detailed information about borrowings [line items]          
Repayment for credit facility       $ 55,000  
Amended Credit Facility [Member]          
Disclosure of detailed information about borrowings [line items]          
Senior secured debt to EBITDA ratio       3  
EBITDA to interest expense, ratio       4.00  
Amended Credit Facility [Member] | Scenario, Plan [Member]          
Disclosure of detailed information about borrowings [line items]          
Total net debt to EBITDA ratio     4.00    
Senior secured debt to EBITDA ratio     2.00    
Amended Credit Facility [Member] | Bottom of range [member] | Ifrs London Interbank Offered Rate (LIBOR) [Member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings, interest rate basis       2.5%  
Amended Credit Facility [Member] | Top of range [member]          
Disclosure of detailed information about borrowings [line items]          
Total net debt to EBITDA ratio   4.50   4.50  
Amended Credit Facility [Member] | Top of range [member] | Ifrs London Interbank Offered Rate (LIBOR) [Member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings, interest rate basis       3.5%  
Revolving Credit Facility [member]          
Disclosure of detailed information about borrowings [line items]          
Undrawn amount in credit facility $ 110,000 $ 110,000   $ 110,000  
Borrowings amount that matured 30,000 30,000   30,000  
Proceeds from credit facility (note 17(a))       65,000 $ 40,000
Repayment for credit facility 55,000        
Borrowing capacity 110,000 110,000   110,000  
Credit facility, remaining borrowing capacity 80,000 80,000   80,000  
Revolving Credit Facility [member] | Maturity Date Scenario One [Member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings amount that matured 30,000 30,000   $ 30,000  
Borrowings, maturity       December 31, 2020  
Revolving Credit Facility [member] | Maturity Date Scenario Two [Member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings, maturity       January 26, 2022  
Non-Revolving Credit Facility [Member]          
Disclosure of detailed information about borrowings [line items]          
Undrawn amount in credit facility $ 40,000 $ 40,000   $ 40,000