Retirement Plans, Asset Allocation for Pension Plan Table (Details)	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total	49.00%	60.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total	34.00%	37.00%
Group Annuity Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	12.00%	0.00%
Alternative Securities
Defined Benefit Plan Disclosure [Line Items]
Total	3.00%	0.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Total	2.00%	3.00%