Retirement Plans And Other Postretirement Benefits (Reconciliation Of Changes In Benefit Obligations And Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	$ 325,426	$ 275,166
Service cost	530	869	$ 3,754
Interest cost	13,217	13,397	12,338
Effect of actuarial (gains) losses related to the following:
Discount rate change	(14,687)	32,089
Retirement rate assumptions and mortality table adjustments	(5,456)	17,331
Effect Of Actuarial (Gains) Losses, Retiree Medical Participation Rate Change	0	0
Other	(746)	490
Benefits paid	(14,432)	(13,916)
Benefit obligation, end of year	303,852	325,426	275,166
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	229,017	232,705
Actual return on plan assets	(6,311)	7,466
Employer contributions	2,368	2,762
Benefits paid	(14,432)	(13,916)
Plan assets at fair value, end of year	210,642	229,017	232,705
Funded status of the plans	(93,210)	(96,409)
Amounts recognized in the consolidated balance sheets:
Net amount recognized	93,210	96,409
Other Post-Retirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	8,372	7,858
Service cost	44	43	58
Interest cost	325	387	345
Effect of actuarial (gains) losses related to the following:
Discount rate change	(356)	732
Retirement rate assumptions and mortality table adjustments	32	(131)
Effect Of Actuarial (Gains) Losses, Retiree Medical Participation Rate Change		(390)
Other	(332)	218
Benefits paid	(965)	(1,026)
Benefit obligation, end of year	7,745	8,372	7,858
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	340	345
Benefits paid	(965)	(1,026)
Plan assets at fair value, end of year	0	0	$ 0
Funded status of the plans	(7,745)	(8,372)
Amounts recognized in the consolidated balance sheets:
Net amount recognized	7,745	8,372
Defined Benefit Plan, Contributions by Plan Participants	625	681
Accrued Expenses | Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	210	130
Accrued Expenses | Other Post-Retirement Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	455	456
Amounts recognized in the consolidated balance sheets:
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	7,290	7,916
Other Noncurrent Liabilities [Member] | Pension Benefits
Amounts recognized in the consolidated balance sheets:
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	$ 93,000	$ 96,279