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Income Taxes (Operating Loss Carryforward Expirations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating loss carryforwards $ (67,822)    
Total 67,822    
Equity component for share-issuance cost deduction (382) $ 32 $ 41
Canada [Member]      
Expiring noncapital loss carryforwards (43,399)    
Capital loss carryforwards 55,367    
Equity component for share-issuance cost deduction 370    
U.S. [Member]      
Expiring net operating loss carryforwards (18,455)    
Mexico [Member]      
Expiring net operating loss carryforwards (5,813)    
Barbados [Member]      
Expiring net operating loss carryforwards (155)    
Australia [Member]      
Operating loss carryforwards (25,909)    
Tax Year 2016 [Member]      
Total 2    
Tax Year 2016 [Member] | Barbados [Member]      
Expiring net operating loss carryforwards (2)    
Tax Year 2017 [Member]      
Total 1    
Tax Year 2017 [Member] | Barbados [Member]      
Expiring net operating loss carryforwards (1)    
Tax Year 2018 [Member]      
Total 6    
Tax Year 2018 [Member] | Barbados [Member]      
Expiring net operating loss carryforwards (6)    
Tax Year 2019 [Member]      
Total 20    
Tax Year 2019 [Member] | Barbados [Member]      
Expiring net operating loss carryforwards (20)    
Tax Year 2020[Member]      
Total 42    
Tax Year 2020[Member] | Barbados [Member]      
Expiring net operating loss carryforwards (42)    
Tax Year 2021 [Member]      
Total 20    
Tax Year 2021 [Member] | Barbados [Member]      
Expiring net operating loss carryforwards (20)    
Tax Year 2022 [Member]      
Total 5,542    
Tax Year 2022 [Member] | Mexico [Member]      
Expiring net operating loss carryforwards (5,511)    
Tax Year 2022 [Member] | Barbados [Member]      
Expiring net operating loss carryforwards (31)    
Tax Year 2023 [Member]      
Total 325    
Tax Year 2023 [Member] | Mexico [Member]      
Expiring net operating loss carryforwards (302)    
Tax Year 2023 [Member] | Barbados [Member]      
Expiring net operating loss carryforwards (23)    
Tax Year 2024 [Member]      
Total 4    
Tax Year 2024 [Member] | Barbados [Member]      
Expiring net operating loss carryforwards (4)    
Tax Year 2025 [Member]      
Total 6    
Tax Year 2025 [Member] | Barbados [Member]      
Expiring net operating loss carryforwards (6)    
Tax Year 2026 [Member]      
Total 1,027    
Tax Year 2026 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards (1,027)    
Tax Year 2027 [Member]      
Total 2,134    
Tax Year 2027 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards (847)    
Tax Year 2027 [Member] | U.S. [Member]      
Expiring net operating loss carryforwards (1,287)    
Tax Year 2028 [Member]      
Total 6,964    
Tax Year 2028 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards (5,245)    
Tax Year 2028 [Member] | U.S. [Member]      
Expiring net operating loss carryforwards (1,719)    
Tax Year 2029 [Member]      
Total 5,992    
Tax Year 2029 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards (4,022)    
Tax Year 2029 [Member] | U.S. [Member]      
Expiring net operating loss carryforwards (1,970)    
Tax Year 2030 [Member]      
Total 6,859    
Tax Year 2030 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards (5,032)    
Tax Year 2030 [Member] | U.S. [Member]      
Expiring net operating loss carryforwards (1,827)    
Tax Year 2031 [Member]      
Total 7,213    
Tax Year 2031 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards (3,806)    
Tax Year 2031 [Member] | U.S. [Member]      
Expiring net operating loss carryforwards (3,407)    
Tax Year 2032 [Member]      
Total 8,720    
Tax Year 2032 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards (6,397)    
Tax Year 2032 [Member] | U.S. [Member]      
Expiring net operating loss carryforwards (2,323)    
Tax Year 2033 [Member]      
Total 9,174    
Tax Year 2033 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards (6,076)    
Tax Year 2033 [Member] | U.S. [Member]      
Expiring net operating loss carryforwards (3,098)    
Tax Year 2034 [Member]      
Total 7,244    
Tax Year 2034 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards (4,420)    
Tax Year 2034 [Member] | U.S. [Member]      
Expiring net operating loss carryforwards (2,824)    
Tax year 2035 [Member]      
Total 3,729    
Tax year 2035 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards (3,729)    
Tax Year 2036 [Member]      
Total 2,798    
Tax Year 2036 [Member] | Canada [Member]      
Expiring noncapital loss carryforwards $ (2,798)