Employee Benefit Plans (Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Amortization of net loss	$ (1,142)	$ (938)	$ (926)
Total recognized in other comprehensive income	2,575	666
Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	1,475	(189)
Amortization of net loss	1,142	938
Amortization of prior service credit	17	20
Total recognized in other comprehensive income	2,634	769
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	(15)	(53)
Amortization of net loss	24	17
Amortization of prior service credit	(68)	(67)
Total recognized in other comprehensive income	$ (59)	$ (103)