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Management of Financial Risk (Capital Management) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Management of Financial Risk [abstract] |  |  |
Equity | $ 725,770 | $ 635,426 | $ 602,804
Credit facilities | 158,616 | 146,535 | $ 69,302
Lease obligations | 19,497 | 23,879 |
Less: Cash, cash equivalents and short-term investments | (131,898) | (83,404) |
Capital amount | $ 771,985 | $ 722,436 |

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