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Stock Compensation Plans (Stock Options) (Details) - USD ($)
$ in Thousands
12 Months Ended 72 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Net tax benefit recognized from stock compensation plans   $ 1,055 $ 3,291  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants during the period       0
Vesting period 4 years      
Contractual term 7 years      
Number of options outstanding 0 0 0 0
Cash proceeds from options exercised $ 0 $ 0 $ 874  
Net tax benefit recognized from stock compensation plans 0 0 320  
Total intrinsic value of options exercised $ 0 $ 0 $ 760