Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,672	$ 6,156	$ 21,162	$ 21,062
Interest cost	3,994	3,683	11,796	11,755
Curtailments	47		47	324
Expected return on plan assets	(5,848)	(5,508)	(17,690)	(16,523)
Amortization of prior service cost (credit)	(51)	273	(152)	200
Amortization of other actuarial (gains) losses	3,617	3,248	12,430	11,019
Total net benefit	8,431	7,852	27,593	27,837
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	497	541	1,591	1,629
Interest cost	427	508	1,273	1,519
Curtailments	(5,444)	(2,212)	(5,444)	(4,049)
Amortization of prior service cost (credit)	(2,641)	(2,837)	(8,121)	(8,708)
Amortization of other actuarial (gains) losses	(55)	(130)	(53)	(391)
Total net benefit	$ (7,216)	$ (4,130)	$ (10,754)	$ (10,000)