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Management of Financial Risk (Schedule of Company's Maximum Exposure to Credit Risk) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Cash and cash equivalents | $ 90,503 | $ 183,074 | $ 82,484
Short term investments | 72,824 | 29,500 |
Marketable securities |  | 556 |
Derivative assets | 2,646 | 140 |
Accounts receivable and other assets | 32,769 | 36,370 |
Income tax receivable | 136 | 130 |
Other non-current receivables | 15,241 | 1,223 |
Credit risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Cash and cash equivalents | 90,503 | 183,074 |
Short term investments | 72,824 | 29,500 |
Marketable securities |  | 556 |
Derivative assets | 2,646 | 140 |
Accounts receivable and other assets | 32,769 | 36,370 |
Income tax receivable | 136 | 130 |
Other non-current receivables | 15,241 | 1,223 |
Total financial assets | $ 214,119 | $ 250,993 |

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