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Income Taxes - Operating Loss Carryforward Expirations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]    
Total $ (80,137)  
Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (51,295)  
Capital loss carryforwards   $ 100,874
U.S.    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards   2,119
Expiring net operating loss carryforwards (20,770)  
Mexico    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (7,971)  
Barbados    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (101)  
Australia    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards   $ 49,418
Tax Year 2021    
Operating Loss Carryforwards [Line Items]    
Total (20)  
Tax Year 2021 | Barbados    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (20)  
Tax Year 2022    
Operating Loss Carryforwards [Line Items]    
Total (6,737)  
Tax Year 2022 | Mexico    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (6,706)  
Tax Year 2022 | Barbados    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (31)  
Tax Year 2023    
Operating Loss Carryforwards [Line Items]    
Total (414)  
Tax Year 2023 | Mexico    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (392)  
Tax Year 2023 | Barbados    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (22)  
Tax Year 2024    
Operating Loss Carryforwards [Line Items]    
Total (4)  
Tax Year 2024 | Barbados    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (4)  
Tax Year 2025    
Operating Loss Carryforwards [Line Items]    
Total (90)  
Tax Year 2025 | Mexico    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (84)  
Tax Year 2025 | Barbados    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (6)  
Tax Year 2026    
Operating Loss Carryforwards [Line Items]    
Total (1,822)  
Tax Year 2026 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (1,027)  
Tax Year 2026 | Mexico    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (789)  
Tax Year 2026 | Barbados    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (6)  
Tax Year 2027    
Operating Loss Carryforwards [Line Items]    
Total (853)  
Tax Year 2027 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (847)  
Tax Year 2027 | Barbados    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (6)  
Tax Year 2028    
Operating Loss Carryforwards [Line Items]    
Total (6,538)  
Tax Year 2028 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (5,245)  
Tax Year 2028 | U.S.    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (1,287)  
Tax Year 2028 | Barbados    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (6)  
Tax Year 2029    
Operating Loss Carryforwards [Line Items]    
Total (5,741)  
Tax Year 2029 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (4,022)  
Tax Year 2029 | U.S.    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (1,719)  
Tax Year 2030    
Operating Loss Carryforwards [Line Items]    
Total (7,002)  
Tax Year 2030 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (5,032)  
Tax Year 2030 | U.S.    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (1,970)  
Tax Year 2031    
Operating Loss Carryforwards [Line Items]    
Total (5,633)  
Tax Year 2031 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (3,806)  
Tax Year 2031 | U.S.    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (1,827)  
Tax Year 2032    
Operating Loss Carryforwards [Line Items]    
Total (9,804)  
Tax Year 2032 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (6,397)  
Tax Year 2032 | U.S.    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (3,407)  
Tax Year 2033    
Operating Loss Carryforwards [Line Items]    
Total (8,508)  
Tax Year 2033 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (6,185)  
Tax Year 2033 | U.S.    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (2,323)  
Tax Year 2034    
Operating Loss Carryforwards [Line Items]    
Total (7,518)  
Tax Year 2034 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (4,420)  
Tax Year 2034 | U.S.    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (3,098)  
Tax year 2035    
Operating Loss Carryforwards [Line Items]    
Total (3,731)  
Tax year 2035 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (3,729)  
Tax year 2035 | U.S.    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (2)  
Tax Year 2036    
Operating Loss Carryforwards [Line Items]    
Total (5,454)  
Tax Year 2036 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (2,799)  
Tax Year 2036 | U.S.    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (2,655)  
Tax Year 2037    
Operating Loss Carryforwards [Line Items]    
Total (4,398)  
Tax Year 2037 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (1,916)  
Tax Year 2037 | U.S.    
Operating Loss Carryforwards [Line Items]    
Expiring net operating loss carryforwards (2,482)  
Tax Year 2038    
Operating Loss Carryforwards [Line Items]    
Total (2,666)  
Tax Year 2038 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards (2,666)  
Tax Year 2039    
Operating Loss Carryforwards [Line Items]    
Total (3,204)  
Tax Year 2039 | Canada    
Operating Loss Carryforwards [Line Items]    
Expiring noncapital loss carryforwards $ (3,204)