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Earnings per Share (Schedule of Earnings per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Earnings per Share [abstract]    
Net income for the period $ 23,796 $ 33,990
Weighted average number of shares ('000's) 160,193 159,785
Earnings per share - basic $ 0.15 $ 0.21
Incremental shares from share units 2,215 1,851
Incremental shares from convertible debenture 2,117  
Weighted average diluted number of shares (000's) 164,525 161,636
Diluted earnings (loss) per share $ 0.14 $ 0.21