Retirement Plans (Pension Allocations By Type Of Fund And Target Allocations) (Details) - Domestic Plan [Member]	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Equity accounts	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity accounts	49.00%	51.00%
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity accounts	36.00%	27.00%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity accounts	10.00%	10.00%
Other Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity accounts	5.00%	12.00%
Minimum [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage	0.42
Minimum [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage	0.32
Minimum [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage	0.07
Minimum [Member] | Other Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage	0.03
Maximum [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage	0.53
Maximum [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage	0.44
Maximum [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage	0.13
Maximum [Member] | Other Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage	0.08