Pension Plans And Other Postretirement Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Transition obligation recognition	$ 34,500
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	15,551	12,936	11,609
Interest cost	24,349	24,134	23,231
Expected return on plan assets	(23,810)	(23,115)	(21,381)
Transition obligation recognition	0	0	0
Amortization of prior service cost	346	475	650
Net loss recognition	11,637	9,493	7,189
Net periodic benefit cost	28,073	23,923	21,298
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2,804	1,805	684
Interest cost	5,056	4,126	2,624
Expected return on plan assets	(1,471)	(1,601)	(1,581)
Transition obligation recognition	505	505	505
Amortization of prior service cost	(149)	(149)	(149)
Net loss recognition	5,020	3,458	1,379
Net periodic benefit cost	$ 11,765	$ 8,144	$ 3,462