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Management of Financial Risk (Capital Management) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Management of Financial Risk [abstract] |  |  |  |
Equity | $ 635,426 |  | $ 602,804 | $ 563,584
Credit facilities | 146,535 |  | 69,302 | $ 39,871
Lease obligations | 23,879 | $ 16,083 | 8,766 |
Less: Cash, cash equivalents and short-term investments | (83,404) |  | (163,327) |
Capital amount | $ 722,436 |  | $ 517,545 |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. + References No definition available. + Details
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