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Consolidated Statements of Comprehensive Income - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Consolidated Statements of Comprehensive Income [abstract]    
Net income for the year $ 23,796,000 $ 33,990,000
Items that will remain permanently in other comprehensive income:    
Change in fair value of marketable securities, net of $nil tax   (69,000)
Items that may in the future be reclassified to profit or loss:    
Change in fair value of hedging instruments, net of $nil tax (665,000) (156,000)
Total other comprehensive loss for the year (665,000) (225,000)
Comprehensive income for the year 23,131,000 33,765,000
Changes in fair value of marketable securities, tax 0 0
Changes in fair value of hedging instruments, tax $ 0 $ 0