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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Basic Net Earnings Per Common Shares [Abstract]        
Earnings from continuing operations $ 17,686 $ 17,444 $ 43,652 $ 36,659
Loss from discontinued operation (389) (604) (1,138) (1,221)
Net earnings available to common stockholders 17,297 16,840 42,514 35,438
Weighted average common shares outstanding (in shares) 22,999,832 22,691,878 22,945,424 22,810,238
Earnings from continuing operations per common share (in dollars per share) $ 0.77 $ 0.77 $ 1.90 $ 1.61
Loss from discontinued operations per common share (in dollars per share) $ (0.02) $ (0.03) $ (0.05) $ (0.06)
Net earnings per common share - Basic (in dollars per share) $ 0.75 $ 0.74 $ 1.85 $ 1.55
Diluted Net Earnings Per Common Share [Abstract]        
Earnings from continuing operations 17,686 17,444 43,652 36,659
Loss from discontinued operation (389) (604) (1,138) (1,221)
Net earnings available to common stockholders $ 17,297 $ 16,840 $ 42,514 $ 35,438
Plus incremental shares from assumed conversions [Abstract]        
Dilutive effect of restricted stock and performance stock (in shares) 232,000 182,000 226,000 182,000
Dilutive effect of stock options (in shares) 7,000 4,000 8,000 7,000
Weighted average common shares outstanding - Diluted (in shares) 23,239,009 22,877,635 23,179,187 22,999,244
Diluted Earning per share [Abstract]        
Net earnings from continuing operations per common share (in dollars per share) $ 0.76 $ 0.76 $ 1.88 $ 1.59
Loss from discontinued operations per common share (in dollars per share) $ (0.02) $ (0.02) $ (0.05) $ (0.05)
Net earnings per common share - Diluted (in dollars per share) $ 0.74 $ 0.74 $ 1.83 $ 1.54
Stock options [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 11,000 26,000 9,000 23,000
Restricted and performance shares [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 217,000 227,000 231,000 233,000