Employee Benefit Plans (Weighted Average Assumptions of Pension and Postretirement Benefits) (Details)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Postretirement Benefits
Used to Determine Benefit Obligations at Measurement Date
Discount rate for benefit obligations	[1]	4.10%	3.40%	4.00%
Discount rate for net periodic cost	[2]	3.40%	3.70%	4.20%
Expected long-term return on plan assets		0.00%	0.00%	0.00%
Rate of compensation increases		0.00%	0.00%	0.00%
Supplemental Employee Retirement Plan
Used to Determine Benefit Obligations at Measurement Date
Discount rate for benefit obligations		3.20%	2.50%	2.40%
Discount rate for net periodic cost		2.50%	2.40%	2.60%

[1] The calculated rate for the unfunded employee retirement plan was 3.20%, 2.50% and 2.40% in 2018, 2017 and 2016, respectively. Since it was terminated in 2015, the defined benefit pension plan did not have a discount rate during the three-year period presented above.

[2] The calculated rate for the unfunded employee retirement plan was 2.50%, 2.40% and 2.60% in 2018, 2017 and 2016, respectively. Since it was terminated in 2015, the defined benefit pension plan did not have a discount rate during the three year period presented above.