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Income Tax (Operating Loss Carryforward Expirations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Operating loss carryforwards $ (63,684)  
Expiring net operating loss carryforwards (63,684)  
Equity component for share-issuance cost deduction 32 $ 41
Canada [Member]    
Expiring noncapital loss carryforwards (40,141)  
Capital loss carryforwards 61,526  
Equity component for share-issuance cost deduction 20,033  
U.S. [Member]    
Expiring net operating loss carryforwards (16,669)  
Mexico [Member]    
Expiring net operating loss carryforwards (6,725)  
Barbados [Member]    
Expiring net operating loss carryforwards (150)  
Australia [Member]    
Operating loss carryforwards (43,153)  
Tax Year 2015 [Member]    
Expiring net operating loss carryforwards (2)  
Tax Year 2015 [Member] | Barbados [Member]    
Expiring net operating loss carryforwards (2)  
Tax Year 2016 [Member]    
Expiring net operating loss carryforwards (1)  
Tax Year 2016 [Member] | Barbados [Member]    
Expiring net operating loss carryforwards (1)  
Tax Year 2017 [Member]    
Expiring net operating loss carryforwards (6)  
Tax Year 2017 [Member] | Barbados [Member]    
Expiring net operating loss carryforwards (6)  
Tax Year 2018 [Member]    
Expiring net operating loss carryforwards (20)  
Tax Year 2018 [Member] | Barbados [Member]    
Expiring net operating loss carryforwards (20)  
Tax Year 2019 [Member]    
Expiring net operating loss carryforwards (42)  
Tax Year 2019 [Member] | Barbados [Member]    
Expiring net operating loss carryforwards (42)  
Tax Year 2020[Member]    
Expiring net operating loss carryforwards (20)  
Tax Year 2020[Member] | Barbados [Member]    
Expiring net operating loss carryforwards (20)  
Tax Year 2021 [Member]    
Expiring net operating loss carryforwards (31)  
Tax Year 2021 [Member] | Barbados [Member]    
Expiring net operating loss carryforwards (31)  
Tax Year 2022 [Member]    
Expiring net operating loss carryforwards (6,398)  
Tax Year 2022 [Member] | Mexico [Member]    
Expiring net operating loss carryforwards (6,375)  
Tax Year 2022 [Member] | Barbados [Member]    
Expiring net operating loss carryforwards (23)  
Tax Year 2023 [Member]    
Expiring net operating loss carryforwards (354)  
Tax Year 2023 [Member] | Mexico [Member]    
Expiring net operating loss carryforwards (350)  
Tax Year 2023 [Member] | Barbados [Member]    
Expiring net operating loss carryforwards (4)  
Tax Year 2026 [Member]    
Expiring net operating loss carryforwards (1,652)  
Tax Year 2026 [Member] | Canada [Member]    
Expiring noncapital loss carryforwards (1,027)  
Tax Year 2026 [Member] | U.S. [Member]    
Expiring net operating loss carryforwards (625)  
Tax Year 2027 [Member]    
Expiring net operating loss carryforwards (2,547)  
Tax Year 2027 [Member] | Canada [Member]    
Expiring noncapital loss carryforwards (847)  
Tax Year 2027 [Member] | U.S. [Member]    
Expiring net operating loss carryforwards (1,700)  
Tax Year 2028 [Member]    
Expiring net operating loss carryforwards (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]    
Expiring net operating loss carryforwards (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]    
Expiring net operating loss carryforwards (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]    
Expiring net operating loss carryforwards (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]    
Expiring net operating loss carryforwards (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]    
Expiring net operating loss carryforwards (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]    
Expiring net operating loss carryforwards (4,420)  
Tax Year 2034 [Member] | Canada [Member]    
Expiring noncapital loss carryforwards (4,420)  
Tax year 2035 [Member]    
Expiring net operating loss carryforwards (3,269)  
Tax year 2035 [Member] | Canada [Member]    
Expiring noncapital loss carryforwards $ (3,269)