Employee Benefit Plans (Summary Of Assets Segregated By Level Of Valuation Inputs Within The Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Total	$ 12,041	$ 16,360	$ 17,117
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total	12,041	10,930
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total	0	4,828
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total	0	0
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total	12,041	1,202
Cash and Cash Equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total	$ 12,041	1,202
Mutual funds/Investment funds
Defined Benefit Plan Disclosure [Line Items]
Total		5,421
Mutual funds/Investment funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total		5,206
Mutual funds/Investment funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total		215
Common stocks
Defined Benefit Plan Disclosure [Line Items]
Total		5,575
Common stocks | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total		3,763
Common stocks | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total		1,812
U.S. Government agencies
Defined Benefit Plan Disclosure [Line Items]
Total		301
U.S. Government agencies | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total		301
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total		1,277
Corporate bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total		1,277
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total		1,223
Corporate bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total		1,223
Alternative investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets, Not Subject to Fair Value Hierarchy		602
Total		1,361
Alternative investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total		759
Alternative investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total		0
Alternative investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total		$ 0