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Earnings Per Share (Basic and Diluted) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Earnings per share [abstract]    
Net earnings for the year $ 123,451 $ 101,825
Net earnings $ 120,991 $ 100,085
Basic EPS (shares) 153,070,000 152,118,000
Basic EPS (in USD per share) $ 0.79 $ 0.66
Effect of Dilutive Securities:    
Stock Options (shares) 283,000 386,000
Diluted EPS (shares) 153,353,000 152,504,000
Diluted EPS (in USD per share) $ 0.79 $ 0.66
Potentially dilutive securities excluded from diluted EPS (shares) 279,943 418,151