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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Basic Net Earnings Per Common Shares [Abstract]        
Earnings from continuing operations $ 13,721 $ 13,693 $ 19,215 $ 20,704
Loss from discontinued operations (317) (355) (617) (659)
Net earnings available to common stockholders 13,404 13,338 18,598 20,045
Weighted average common shares outstanding (in shares) 22,872,618 22,867,323 22,870,069 22,787,337
Net earnings from continuing operations per common share (in dollars per share) $ 0.60 $ 0.60 $ 0.84 $ 0.91
Loss from discontinued operations per common share (in dollars per share) $ (0.01) $ (0.02) $ (0.03) $ (0.03)
Net earnings per common share - Basic (in dollars per share) $ 0.59 $ 0.58 $ 0.81 $ 0.88
Diluted Net Earnings Per Common Share [Abstract]        
Earnings from continuing operations 13,721 13,693 19,215 20,704
Interest income on debenture conversions (net of income tax expense) 0 40 0 317
Earnings from continuing operations plus assumed conversions 13,721 13,733 19,215 21,021
Loss from discontinued operation (317) (355) (617) (659)
Net earnings available to common stockholders plus assumed conversions $ 13,404 $ 13,378 $ 18,598 $ 20,362
Weighted average common shares outstanding (in shares) 22,872,618 22,867,323 22,870,069 22,787,337
Plus incremental shares from assumed conversions [Abstract]        
Dilutive effect of restricted stock and performance stock (in shares) 229,000 189,000 234,000 167,000
Dilutive effect of stock options (in shares) 3,000 14,000 8,000 13,000
Dilutive effect of convertible debentures (in shares) 0 126,000 0 471,000
Weighted average common shares outstanding - Diluted (in shares) 23,104,654 23,196,125 23,111,732 23,438,247
Diluted Earning per share [Abstract]        
Net earnings from continuing operations per common share (in dollars per share) $ 0.59 $ 0.59 $ 0.83 $ 0.90
Loss from discontinued operations per common share (in dollars per share) $ (0.01) $ (0.01) $ (0.03) $ (0.03)
Net earnings per common share - Diluted (in dollars per share) $ 0.58 $ 0.58 $ 0.80 $ 0.87
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) 29,000 235,000 25,000 236,000
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) 216,000 153,000 213,000 159,000