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Employee Benefit Plans (Other Changes In Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other comprehensive income (loss) at December 31, prior year	$ (97,466)	$ (88,580)
Net gain (loss) arising during period	4,090	16,927
Actuarial loss (gain)	9,576	8,042
Curtailment loss recognized
Other comprehensive income (loss) at December 31, current year	(91,979)	(97,466)
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other comprehensive income (loss) at December 31, prior year	3,092	3,242
Net gain (loss) arising during period	(4,042)	582
Prior Service credit (cost) arising during period
Actuarial loss (gain)		(155)
Prior service cost	(577)	(577)
Other comprehensive income (loss) at December 31, current year	$ (1,527)	$ 3,092

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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