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Supplemental Cashflow Information (Schedule of Changes in Liabilities Arising from Financing Activities) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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