Retirement Plans And Other Postretirement Benefits (Schedule Of Amounts Recognized Before Related Deferred Income Taxes In Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (benefit)	$ 87	$ 270	$ (887)
Net actuarial (gain) loss	166,678	116,519	167,009
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (benefit)	0	0	0
Net actuarial (gain) loss	$ (1,154)	$ (1,773)	$ (855)

Retirement Plans And Other Postretirement Benefits (Schedule Of Amounts Recognized Before Related Deferred Income Taxes In Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Pension Benefits

Defined Benefit Plan Disclosure [Line Items]

Prior service cost (benefit)

$ 87

$ 270

$ (887)

Net actuarial (gain) loss

166,678

116,519

167,009