Employee Benefit Plans (The Major Categories Of Plan Assets Measured At Fair Value On a Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Cash equivalents	$ 1,259	$ 1,845
Equity securities	31,848	30,685
Fixed income securities	63,176	49,571
Total Plan investments	102,176	87,827
Foreign Currencies [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash equivalents	6	16
Short Term Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash equivalents	1,253	1,829
Commingled Pension Trust Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity securities	31,848	30,685
Fixed income securities	63,171	49,566
Total Plan investments	5,893	5,726
All Other Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fixed income securities	5	5
Level 1 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash equivalents	6	16
Total Plan investments	6	16
Level 1 Inputs [Member] | Foreign Currencies [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash equivalents	6	16
Level 2 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash equivalents	1,253	1,829
Equity securities	31,848	30,685
Fixed income securities	63,176	49,571
Total Plan investments	102,170	87,811
Level 2 Inputs [Member] | Short Term Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash equivalents	1,253	1,829
Level 2 Inputs [Member] | Commingled Pension Trust Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity securities	31,848	30,685
Fixed income securities	63,171	49,566
Total Plan investments	5,893	5,726
Level 2 Inputs [Member] | All Other Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fixed income securities	$ 5	$ 5