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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
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