Pension And Postretirement Benefits (Estimated Components Of The Recorded Net Periodic Benefit Cost For Pension And Postretirement Benefits) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension [Member]
Service cost	$ 2,815	$ 2,761	$ 8,446	$ 8,282
Interest cost	5,808	5,753	17,425	17,259
Expected return on assets	(6,121)	(5,255)	(18,364)	(15,766)
Prior service cost (credit)	133	146	400	437
Actuarial loss (gain)	1,581	2,554	4,743	7,661
Settlement charge (adjustment)	332	923	346	1,006
Total net periodic benefit cost	4,548	6,882	12,996	18,879
Postretirement Benefits [Member]
Service cost	88	137	263	411
Interest cost	556	688	1,669	2,063
Expected return on assets
Prior service cost (credit)	(435)	(372)	(1,306)	(1,117)
Actuarial loss (gain)	(21)		(64)
Settlement charge (adjustment)
Total net periodic benefit cost	$ 188	$ 453	$ 562	$ 1,357