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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Basic Net Earnings Per Common Share [Abstract]        
Earnings from continuing operations $ 36,212 $ 22,654 $ 57,675 $ 56,313
Loss from discontinued operations (7,587) (7,903) (9,456) (9,914)
Net earnings available to common stockholders $ 28,625 $ 14,751 $ 48,219 $ 46,399
Weighted average common shares outstanding (in shares) 22,349,093 22,329,835 22,372,466 22,359,637
Earnings from continuing operations per common share (in dollars per share) $ 1.62 $ 1.01 $ 2.58 $ 2.52
Loss from discontinued operations per common share (in dollars per share) (0.34) (0.35) (0.42) (0.44)
Net earnings per common share - Basic (in dollars per share) $ 1.28 $ 0.66 $ 2.16 $ 2.08
Diluted Net Earnings Per Common Share [Abstract]        
Earnings from continuing operations $ 36,212 $ 22,654 $ 57,675 $ 56,313
Loss from discontinued operations (7,587) (7,903) (9,456) (9,914)
Net earnings available to common stockholders $ 28,625 $ 14,751 $ 48,219 $ 46,399
Weighted average common shares outstanding (in shares) 22,349,093 22,329,835 22,372,466 22,359,637
Plus incremental shares from assumed conversions [Abstract]        
Dilutive effect of restricted stock and performance stock (in shares) 409,000 424,000 423,000 454,000
Weighted average common shares outstanding - Diluted (in shares) 22,758,458 22,754,440 22,795,426 22,814,228
Earnings from continuing operations per common share (in dollars per share) $ 1.59 $ 1.00 $ 2.53 $ 2.47
Loss from discontinued operations per common share (in dollars per share) (0.33) (0.35) (0.41) (0.44)
Net earnings per common share - Diluted (in dollars per share) $ 1.26 $ 0.65 $ 2.12 $ 2.03
Restricted and Performance Shares [Member]        
Earnings Per Share[Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 268,000 269,000 271,000 260,000