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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Basic Net Earnings Per Common Shares [Abstract]        
Earnings from continuing operations $ 21,055 $ 19,194 $ 53,573 $ 42,341
Loss from discontinued operations (425) (728) (1,495) (1,549)
Net earnings available to common stockholders $ 20,630 $ 18,466 $ 52,078 $ 40,792
Weighted average common shares outstanding (in shares) 22,716,279 22,770,865 22,688,071 22,865,978
Earnings from continuing operations per common share (in dollars per share) $ 0.93 $ 0.84 $ 2.36 $ 1.85
Loss from discontinued operations per common share (in dollars per share) (0.02) (0.03) (0.06) (0.07)
Net earnings per common share - Basic (in dollars per share) $ 0.91 $ 0.81 $ 2.30 $ 1.78
Diluted Net Earnings Per Common Share [Abstract]        
Earnings from continuing operations $ 21,055 $ 19,194 $ 53,573 $ 42,341
Loss from discontinued operations (425) (728) (1,495) (1,549)
Net earnings available to common stockholders $ 20,630 $ 18,466 $ 52,078 $ 40,792
Weighted average common shares outstanding (in shares) 22,716,279 22,770,865 22,688,071 22,865,978
Plus incremental shares from assumed conversions [Abstract]        
Dilutive effect of restricted stock and performance-based stock (in shares) 382,000 363,000 357,000 354,000
Dilutive effect of stock options (in shares) 0 0 0 0
Weighted average common shares outstanding - Diluted (in shares) 23,097,699 23,133,869 23,044,604 23,220,381
Earnings from continuing operations per common share (in dollars per share) $ 0.91 $ 0.83 $ 2.32 $ 1.82
Loss from discontinued operations per common share (in dollars per share) (0.02) (0.03) (0.06) (0.06)
Net earnings per common share - Diluted (in dollars per share) $ 0.89 $ 0.80 $ 2.26 $ 1.76
Restricted and Performance-Based Shares [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 297,000 315,000 326,000 338,000