Employee Benefits (Retirement Plans And Other Postretirement Benefits) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Retirement Income Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,430	$ 2,189	$ 4,830	$ 4,414	$ 9,245	$ 7,839
Interest cost	3,400	3,400	6,800	6,778	13,579	13,771
Expected return on plan assets	(4,275)	(3,611)	(8,550)	(7,221)	(15,772)	(14,268)
Amortization of net (gain) loss	2,745	2,713	5,420	5,678	11,098	8,950
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	25	31	50	58	107	115
Net periodic benefit cost	4,325	4,722	8,550	9,707	18,257	16,407
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,100	1,119	2,200	2,189	4,389	3,683
Interest cost	1,375	1,410	2,750	2,825	5,576	5,515
Expected return on plan assets	(475)	(453)	(950)	(888)	(1,776)	(1,799)
Amortization of net (gain) loss	0	147	0	307	308	287
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(1,425)	(1,468)	(2,850)	(2,938)	(5,789)	(5,902)
Net periodic benefit cost	$ 575	$ 755	$ 1,150	$ 1,495	$ 2,708	$ 1,784