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Supplemental Cashflow Information (Schedule of Changes in Liabilities Arising from Financing Activities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Amortization of transaction costs , discount $ 2,081 $ 475
Bank Loan    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 109,430 69,302
Additions 65,000 40,000
Interest 420 128
Payments (55,000)  
Liabilities arising from financing activities at end of period 119,850 109,430
Convertible Debenture    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 37,105  
Additions   46,000
Interest 1,661 347
Transaction costs   (2,101)
Equity component   (7,141)
Liabilities arising from financing activities at end of period 38,766 37,105
Lease obligation    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 23,879 16,082
Additions 2,684 14,944
Interest 1,920 1,848
Payments (8,438) (9,048)
Terminations (497)  
Foreign exchange (51) 53
Liabilities arising from financing activities at end of period 19,497 23,879
Derivatives    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 894 224
Additions 176  
Interest 563  
Payments (560)  
Change in fair value 187 670
Liabilities arising from financing activities at end of period $ 1,260 $ 894