Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Recognition of actuarial loss (gain)	$ 71,843	[1]	$ (62,503)	[1]	$ 23,443	[1]
Recognition of prior service credit (cost)	(68)	[1]	(7,675)	[1]	(6,791)	[1]
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	10,645		12,824		10,206
Interest cost	12,839		11,400		10,506
Expected return on plan assets	(18,858)		(16,127)		(12,872)
Actuarial loss (gain)	701		8,276		7,395
Prior service (credit) cost	0		0		0
Net periodic benefit cost	5,327		16,373		15,235
Current year actuarial loss (gain)	72,737		(61,759)		23,557
Recognition of actuarial loss (gain)	(701)		(8,276)		(7,395)
Recognition of prior service credit (cost)	0		0		0
Total recognized in other comprehensive income	72,036		(70,035)		16,162
Total recognized in net periodic benefit cost and other comprehensive income	77,363		(53,662)		31,397
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0		0		0
Interest cost	73		70		73
Expected return on plan assets	0		0		0
Actuarial loss (gain)	16		19		14
Prior service (credit) cost	0		0		0
Net periodic benefit cost	89		89		87
Current year actuarial loss (gain)	180		(138)		131
Recognition of actuarial loss (gain)	(16)		(19)		(14)
Recognition of prior service credit (cost)	0		0		0
Total recognized in other comprehensive income	164		(157)		117
Total recognized in net periodic benefit cost and other comprehensive income	253		(68)		204
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0		0		0
Interest cost	110		112		133
Actuarial loss (gain)	(649)		(620)		(618)
Prior service (credit) cost	0		0		0
Net periodic benefit cost	(539)		(508)		(485)
Current year actuarial loss (gain)	(1,065)		(600)		(235)
Recognition of actuarial loss (gain)	649		620		618
Recognition of prior service credit (cost)	0		0		0
Adjustment for actual Medicare Part D reimbursement	(8)		(5)		(10)
Total recognized in other comprehensive income	(424)		15		373
Total recognized in net periodic benefit cost and other comprehensive income	$ (963)		$ (493)		$ (112)

[1] (a) Actuarial gains (losses) are amortized into costs of sales and operating expenses or selling, general and administrative expenses as appropriate. (See Note 9 Retirement Plans)