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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, 2017 | Dec. 31, 2016
Long-term borrowings [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Liabilities arising from financing activities at beginning of period | $ 39,768 | $ 39,486
Amortization of transaction costs | 103 | 282
Liabilities arising from financing activities at end of period | 39,871 | 39,768
Lease liabilities [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Liabilities arising from financing activities at beginning of period | 3,034 | 1,884
Additions |  | 2,362
Principal payments | (2,128) | (1,212)
Liabilities arising from financing activities at end of period | 906 | 3,034
Assets held to hedge liabilities arising from financing activities [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Liabilities arising from financing activities at beginning of period | 253 | 351
Interest accrued | (25) | (14)
Change in fair value | (368) | (84)
Liabilities arising from financing activities at end of period | $ (140) | $ 253

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