Employee Retirement Plans (Weighted Average Assumptions) (Details) - Pension Benefits	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31,
Discount rate (beginning of year rate)	3.52%	3.91%	3.32%
Expected long-term return on plan assets	6.50%	6.50%	6.50%
Weighted-average assumptions used to determine benefit obligations at December 31,
Discount rate (end of year rate)	4.22%	3.52%