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Retirement Plans, Weighted-Average Assumption Used to Determine Benefit Obligation (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 4.20% 4.50%
Health care cost trend rate [Abstract]    
Initial rate 0.00% 0.00%
Ultimate rate 0.00% 0.00%
SERP [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 4.20% 4.50%
Rate of compensation increase 0.00% 0.00%
Health care cost trend rate [Abstract]    
Initial rate 0.00% 0.00%
Ultimate rate 0.00% 0.00%
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 4.20% 4.50%
Rate of compensation increase 0.00% 0.00%
Health care cost trend rate [Abstract]    
Initial rate 7.00% 6.50%
Ultimate rate 5.00% 5.00%
Years to ultimate 2021 2019