Employee Benefits Schedule of Weighted Average Actuarial Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Costs (Details)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Medical Plan [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate used in calculating benefit obligation		3.40%	4.30%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate used in calculating net periodic benefit cost		4.30%	3.60%	4.10%
Rate of increase in compensation used in calculating net periodic benefit cost	[1]			3.50%
Pension Plan and SERP [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate used in calculating benefit obligation		3.13%	4.19%
Rate of increase in compensation used for calculating benefit obligation	[2]		3.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate used in calculating net periodic benefit cost		4.19%	3.50%	4.00%
Expected long-term return on plan assets used in calculating net periodic benefit cost		5.70%	6.00%	6.00%
Rate of increase in compensation used in calculating net periodic benefit cost	[1]	3.00%	3.50%	3.50%

[1] The Pension Plan was frozen effective January 1, 2016, and as a result, the rate of increase in compensation for participants is no longer considered an assumption used by the Company to calculate the net period benefit cost of the Pension Plan. As such, for the years ended December 31, 2019 and 2018, the rate of increase in compensation is only used for the SERP.

[2] The Pension Plan was frozen effective January 1, 2016, and as a result, the rate of increase in compensation for participants is no longer considered an assumption used by the Company to calculate the value of the Pension Plan. As such, for the year ended December 31, 2018, the rate of increase in compensation is only used for the SERP. For the year ended December 31, 2019, there are no longer any eligible participants in the SERP. As such, the rate of increase in compensation is