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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Basic Net Earnings Per Common Share [Abstract]    
Earnings from continuing operations $ 13,104 $ 8,597
Loss from discontinued operations (888) (608)
Net earnings available to common stockholders $ 12,216 $ 7,989
Weighted average common shares outstanding (in shares) 22,421,795 22,498,510
Earnings from continuing operations per common share (in dollars per share) $ 0.58 $ 0.38
Loss from discontinued operations per common share (in dollars per share) (0.04) (0.02)
Net earnings per common share - Basic (in dollars per share) $ 0.54 $ 0.36
Diluted Net Earnings Per Common Share [Abstract]    
Earnings from continuing operations $ 13,104 $ 8,597
Loss from discontinued operations (888) (608)
Net earnings available to common stockholders $ 12,216 $ 7,989
Weighted average common shares outstanding (in shares) 22,421,795 22,498,510
Plus incremental shares from assumed conversions [Abstract]    
Dilutive effect of restricted stock and performance stock (in shares) 483,000 468,000
Weighted average common shares outstanding - Diluted (in shares) 22,905,364 22,967,281
Earnings from continuing operations per common share (in dollars per share) $ 0.57 $ 0.37
Loss from discontinued operations per common share (in dollars per share) (0.04) (0.02)
Net earnings per common share - Diluted (in dollars per share) $ 0.53 $ 0.35
Restricted and Performance-Based Shares [Member]    
Earnings Per Share[Abstract]    
Antidilutive securities excluded from computation of earnings per share (in shares) 252,000 277,000