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Retirement Plans, Weighted-Average Assumption Used to Determine Benefit Obligation (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Feb. 14, 2018
Pension Plan [Member]        
Weighted-average assumption used to determine benefit obligation at end of year [Abstract]        
Discount rate [1] 4.40% 3.70%    
Health care cost trend rate [Abstract]        
Initial rate 0.00% 0.00%    
Ultimate rate 0.00% 0.00%    
Pension Plan [Member] | Higman [Member]        
Weighted-average assumption used to determine benefit obligation at end of year [Abstract]        
Discount rate 4.40%   4.02% 4.13%
SERP [Member]        
Weighted-average assumption used to determine benefit obligation at end of year [Abstract]        
Discount rate [1] 4.40% 3.70%    
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]        
Weighted-average assumption used to determine benefit obligation at end of year [Abstract]        
Discount rate [1] 4.40% 3.70%    
Rate of compensation increase 0.00% 0.00%    
Health care cost trend rate [Abstract]        
Initial rate 7.00% 7.00%    
Ultimate rate 5.00% 5.00%    
Years to ultimate 2025 2022    
[1] The discount rate for the Higman pension plan in 2018 was changed from 4.13% as of February 14, 2018 and 4.02% as of March 31, 2018 to 4.40% as of December 31, 2018.