Pension and Profit Sharing - Plan Asset Allocation (Details)	Dec. 31, 2018	Dec. 31, 2017
Plan asset weighted average allocation	100.00%	100.00%
Equity Securities
Plan asset weighted average allocation	65.00%	67.00%
Fixed Income Securities
Plan asset weighted average allocation	33.00%	32.00%
Other Securities/Investments
Plan asset weighted average allocation	2.00%	1.00%