Employee Benefit Plans (Other Changes In Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other comprehensive income (loss) at December 31, prior year	$ (96,965)	$ (91,920)
Net gain (loss) arising during period	(4,398)	(12,982)
Actuarial loss (gain)	8,366	7,937
Curtailment loss recognized	6,209
Other comprehensive income (loss) at December 31, current year	(86,788)	(96,965)
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other comprehensive income (loss) at December 31, prior year	(3,809)	(5,139)
Net gain (loss) arising during period	(4,038)	668
Prior Service credit (cost) arising during period	3,526	794
Prior service cost	(131)	(132)
Actuarial loss (gain)	192
Other comprehensive income (loss) at December 31, current year	$ (4,260)	$ (3,809)