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Earnings Per Share and Capital Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic      
Net Income $ 59,743 $ 60,484 $ 61,058
Less: Distributed earnings to common shareholders 33,408 32,690 32,125
Less: Distributed earnings to participating securities 187 207 177
Undistributed earnings 26,148 27,587 28,756
Undistributed earnings allocated to common shareholders 26,003 27,414 28,599
Undistributed earnings allocated to participating securities   173 157
Total income available to common shareholders, basic $ 59,411 $ 60,104 $ 60,724
Weighted average Common Shares outstanding, basic 36,552,000 37,389,000 38,658,000
Basic earnings per Common Share:      
Income from continuing operations (in dollars per share) $ 1.63 $ 1.61 $ 1.57
Net Income (in dollars per share) $ 1.63 $ 1.61 $ 1.57
Diluted      
Total income available to common shareholders, basic $ 59,411 $ 60,104 $ 60,724
Undistributed earnings for dilutive stock options 145 173 157
Total common shareholders earnings, diluted $ 59,556 $ 60,277 $ 60,881
Weighted average Common Shares outstanding, basic 36,552,000 37,389,000 38,658,000
Stock-based compensation (in shares) [1] 198,000 225,000 222,000
Weighted average common shares outstanding, diluted 36,750,000 37,614,000 38,880,000
Diluted earnings per Common Share:      
Income from continuing operations (in dollars per share) $ 1.62 $ 1.60 $ 1.57
Net Income (in dollars per share) $ 1.62 $ 1.60 $ 1.57
Stock option and restricted stock option outstanding      
Options outstanding (in shares) 136,560    
Restricted Stock Units      
Share based compensation arrangement      
Restricted stock units outstanding (in shares) 209,932    
[1] (1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 136,560 stock options and 209,932 restricted stock units, including performance awards, at December 31, 2016 were deemed to be outstanding in accordance with accounting guidance on earnings per share.