Retirement Plans And Other Postretirement Benefits (Reconciliation Of Changes In Benefit Obligations And Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End	6.00%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End	6.00%	6.50%	6.50%
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	$ 318,123	$ 303,126
Service cost	17	194	$ 231
Interest cost	11,442	12,575	13,323
Effect of actuarial (gains) losses related to the following:
Discount rate change	(23,653)	21,055
Retirement rate assumptions and mortality table adjustments	(914)	(2,145)
Other	(2,326)	(1,921)
Benefits paid	15,449	14,761
Benefit obligation, end of year	287,240	318,123	303,126
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	226,354	214,559
Actual return on plan assets	(14,148)	21,034
Employer contributions	8,610	5,522
Benefits paid	15,449	14,761
Plan assets at fair value, end of year	205,367	226,354	214,559
Funded status of the plans	(81,873)	(91,769)
Amounts recognized in the consolidated balance sheets:
Net amount recognized	81,873	91,769
Benefits paid	15,449	14,761
Benefits paid	15,449	14,761
Other Post-Retirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	7,704	7,436
Service cost	36	33	38
Interest cost	271	301	337
Effect of actuarial (gains) losses related to the following:
Discount rate change	(546)	471
Retirement rate assumptions and mortality table adjustments	6	15
Other	(285)	(245)
Plan participant contributions	656	646
Benefits paid	953	953
Benefit obligation, end of year	6,889	7,704	7,436
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	297	307
Plan participant contributions	656	646
Benefits paid	953	953
Plan assets at fair value, end of year	0	0	$ 0
Funded status of the plans	(6,889)	(7,704)
Amounts recognized in the consolidated balance sheets:
Net amount recognized	6,889	7,704
Plan participant contributions	656	646
Plan participant contributions	656	646
Benefits paid	953	953
Benefits paid	953	953
Accrued Expenses | Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Liability, Defined Benefit Plan, Current	182	182
Accrued Expenses | Other Post-Retirement Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Liability, Defined Benefit Plan, Current	456	457
Amounts recognized in the consolidated balance sheets:
Liability, Defined Benefit Plan, Noncurrent	6,433	7,247
Other Noncurrent Liabilities [Member] | Pension Benefits
Amounts recognized in the consolidated balance sheets:
Liability, Defined Benefit Plan, Noncurrent	$ 81,691	$ 91,587