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Retirement Plans (Weighted-average rate assumptions of the Pension and Postretirement Plans) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate used in determining benefit obligation — December 31 4.32% 3.68% 4.22%
Discount rate used in determining expense 3.68% 4.22% 4.55%
Discount rate used in determining expense — prior to remeasurement 0.00% 3.81% 0.00%
Expected long-term return on Pension Plan assets 6.50% 6.75% 6.75%
Rate of compensation increase used in determining benefit obligation — December 31 0.00% 0.00% 3.50%
Rate of compensation increase used in determining pension expense 0.00% 3.50% 3.50%
Year 1 increase in cost of postretirement benefits 0.00% 0.00% 0.00%
Postretirement Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate used in determining benefit obligation — December 31 4.11% 3.41% 3.79%
Discount rate used in determining expense 3.41% 3.79% 4.23%
Discount rate used in determining expense — prior to remeasurement 0.00% 0.00% 0.00%
Expected long-term return on Pension Plan assets 0.00% 0.00% 0.00%
Rate of compensation increase used in determining benefit obligation — December 31 0.00% 0.00% 0.00%
Rate of compensation increase used in determining pension expense 0.00% 0.00% 0.00%
Year 1 increase in cost of postretirement benefits 7.50% 6.50% 7.00%
SERP      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate used in determining benefit obligation — December 31 4.32% 3.38% 3.63%
Discount rate used in determining expense 0.00% 0.00% 4.51%
Discount rate used in determining expense — prior to remeasurement 3.38% 3.63% 2.87%
Expected long-term return on Pension Plan assets 0.00% 0.00% 0.00%
Rate of compensation increase used in determining benefit obligation — December 31 0.00% 0.00% 3.50%
Rate of compensation increase used in determining pension expense 0.00% 3.50% 3.50%
Year 1 increase in cost of postretirement benefits 0.00% 0.00% 0.00%