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Incentive Compensation Plans and Retirement Plans (Shares Available for Grant) (Details) - 2008 Long-Term Incentive Plan - shares
Mar. 31, 2018
Aug. 06, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of common stock shares authorized to issue 6,501,998  
Stock repurchase program, additional number of shares authorized to be repurchased   1,000,000
Number of shares available for grant 1,717,799  
Shares issued per each award granted 1.87  
Shares available for grant, payout percentage 100.00%  
Actual Payout 200%    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for grant, actual payout percentage 200.00%  
Minimum | Actual Payout Range 0% to 150%    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for grant, actual payout percentage 0.00%  
Maximum | Actual Payout Range 0% to 150%    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for grant, actual payout percentage 150.00%  
Shares initially authorized under the Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock repurchase program, additional number of shares authorized to be repurchased 1,000,000  
Shares Authorized under Incentive Plan on August 12, 2008 and August 6, 2013    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of common stock shares authorized to issue 2,530,000