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Bank Loan (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Jan. 26, 2018
Apr. 30, 2015
Jun. 30, 2014
Disclosure of detailed information about borrowings [line items]        
Maximum debt to EBITDA ratio 3.00%      
Term Credit Facility [member]        
Disclosure of detailed information about borrowings [line items]        
Notional amount     $ 60,000  
Borrowings, maturity April 1, 2019      
Secured bank loans received     $ 40,000  
Borrowings, interest rate basis Interest on the Credit Facility is calculated using the one, two, three, or six month US$ LIBOR rates plus a graduated margin based on the Company's leverage ratio, as defined in the Credit Facility. Interest is payable one month in arrears.      
Term Credit Facility [member] | Entering into significant commitments or contingent liabilities [member]        
Disclosure of detailed information about borrowings [line items]        
Notional amount   $ 40,000    
Revolving Credit Facillity [member] | Entering into significant commitments or contingent liabilities [member]        
Disclosure of detailed information about borrowings [line items]        
Notional amount   $ 80,000    
Tangible Net Worth [member]        
Disclosure of detailed information about borrowings [line items]        
Minimum tangible net worth percentage       85.00%
Positive Quarterly Net Income [member]        
Disclosure of detailed information about borrowings [line items]        
Minimum tangible net worth percentage       50.00%
Value of any Equity Interests Issued [member]        
Disclosure of detailed information about borrowings [line items]        
Minimum tangible net worth percentage       50.00%