Employee Benefits (Schedule Of Amounts Recognized In Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive income, benefits, net of tax	$ 16,351		$ 15,143
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss	20,831		20,325
Prior service cost	594		890
Total before tax	21,425	[1]	21,215	[1]
Accumulated other comprehensive income, benefits, net of tax	13,015		12,873
Post-Retirement Healthcare Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss	5,358		3,523
Prior service cost	134		218
Total before tax	5,492	[1]	3,741	[1]
Accumulated other comprehensive income, benefits, net of tax	$ 3,336		$ 2,270

[1] (1)For 2012, after-tax totals for pension benefits and post-retirement healthcare benefits were $13,015 and $3,336, respectively. The sum of these amounts ($16,351) is reflected in stockholders' equity as accumulated other comprehensive income. For 2011, after-tax totals for pension benefits and post-retirement healthcare benefits were $12,873 and $2,270, respectively. The sum of these amounts ($15,143) is reflected in stockholders' equity as accumulated other comprehensive income.