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Retirement Plans (Schedule of Target and Actual Allocation of Plan Assets) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Target plan asset allocations 100.00%  
Actual plan asset allocations 100.00% 100.00%
Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Target plan asset allocations 28.00%  
Actual plan asset allocations 28.00% 31.00%
Debt securities    
Defined Benefit Plan Disclosure [Line Items]    
Target plan asset allocations 50.00%  
Actual plan asset allocations 50.00% 48.00%
Other    
Defined Benefit Plan Disclosure [Line Items]    
Target plan asset allocations 22.00%  
Actual plan asset allocations 22.00% 21.00%