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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Basic Net Earnings Per Common Share [Abstract]        
Earnings from continuing operations $ 11,842 $ 20,555 $ 21,463 $ 33,659
Loss from discontinued operations (875) (1,123) (1,869) (2,011)
Net earnings available to common stockholders $ 10,967 $ 19,432 $ 19,594 $ 31,648
Weighted average common shares outstanding (in shares) 22,330,476 22,328,292 22,384,281 22,374,785
Earnings from continuing operations per common share (in dollars per share) $ 0.53 $ 0.92 $ 0.96 $ 1.50
Loss from discontinued operations per common share (in dollars per share) (0.04) (0.05) (0.08) (0.09)
Net earnings per common share - Basic (in dollars per share) $ 0.49 $ 0.87 $ 0.88 $ 1.41
Diluted Net Earnings Per Common Share [Abstract]        
Earnings from continuing operations $ 11,842 $ 20,555 $ 21,463 $ 33,659
Loss from discontinued operations (875) (1,123) (1,869) (2,011)
Net earnings available to common stockholders $ 10,967 $ 19,432 $ 19,594 $ 31,648
Weighted average common shares outstanding (in shares) 22,330,476 22,328,292 22,384,281 22,374,785
Plus incremental shares from assumed conversions [Abstract]        
Dilutive effect of restricted stock and performance stock (in shares) 389,000 468,000 410,000 482,000
Weighted average common shares outstanding - Diluted (in shares) 22,718,680 22,795,677 22,793,606 22,857,435
Earnings from continuing operations per common share (in dollars per share) $ 0.52 $ 0.90 $ 0.94 $ 1.47
Loss from discontinued operations per common share (in dollars per share) (0.04) (0.05) (0.08) (0.09)
Net earnings per common share - Diluted (in dollars per share) $ 0.48 $ 0.85 $ 0.86 $ 1.38
Restricted and Performance Shares [Member]        
Earnings Per Share[Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 261,000 248,000 257,000 242,000