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Retirement Plans (Weighted-Average Expense Assumptions) (Details)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Expected return on plan assets 6.37%    
Retirement Income Plan [Member]      
Discount rate 4.29% 5.16% 4.66%
Expected return on plan assets 6.27% 6.92% 7.40%
Rate of compensation increase 4.00% 4.00% 4.00%
Discount rate used to value the liability 4.69% 4.29%  
Pension Plan Service Cost [Member]      
Discount rate [1] 4.52%    
Pension Plan Interest Cost [Member]      
Discount rate [1] 4.02%    
[1] Our latest measurement date was December 31, 2015 and we increased our expected return on plan assets to 6.37%, reflecting the current interest rate environment. When determining the most appropriate discount rate to be used in the valuation, we consider, among other factors, our expected payout patterns of the plans' obligations as well as our investment strategy and we ultimately select the rate that we believe best represents our estimate of the inherent interest rate at which our pension and post-retirement life benefits can be effectively settled. Effective January 1, 2016, the approach used to calculate the service and interest components of net periodic benefit cost for benefit plans was changed to provide a more precise measurement of service and interest costs. Historically, we calculated these service and interest components utilizing a single weighted-average discount rate derived from the yield curve used to measure the benefit obligation at the beginning of the period. Going forward, we have elected to utilize an approach that discounts the individual expected cash flows using the applicable spot rates derived from the yield curve over the projected cash flow period. We will account for this change prospectively as a change in accounting estimate. The weighted average discount rates used to determine 2016 service and interest costs are 4.52% and 4.02%, respectively.