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Earnings Per Share (Basic and Diluted) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Earnings per share [abstract]    
Net earnings for the period $ 12,041 $ 123,451
Net earnings $ 10,294 $ 120,991
Basic EPS (shares) 153,315,000 153,070,000
Basic EPS (in USD per share) $ 0.07 $ 0.79
Effect of Dilutive Securities:    
Stock Options (shares) 207,000 283,000
Diluted EPS (shares) 153,522,000 153,353,000
Diluted EPS (in USD per share) $ 0.07 $ 0.79
Potentially dilutive securities excluded from diluted EPS (shares) 45,705 279,943