Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Curtailments	$ (2,200)		$ (1,770)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6,156	4,122	21,062	12,367
Interest cost	3,683	4,063	11,755	12,190
Curtailments			324
Expected return on plan assets	(5,508)	(5,453)	(16,523)	(16,359)
Amortization of prior service cost (credit)	273	(47)	200	(142)
Amortization of other actuarial (gains) losses	3,248	2,187	11,019	6,561
Net benefit cost (credit)	7,852	4,872	27,837	14,617
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	541	1,493	1,629	2,416
Interest cost	508	1,125	1,519	2,152
Curtailments	(2,212)	0	(4,049)	0
Amortization of prior service cost (credit)	(2,837)	(636)	(8,708)	(1,773)
Amortization of other actuarial (gains) losses	(130)	(775)	(391)	(2,325)
Net benefit cost (credit)	$ (4,130)	$ 1,207	$ (10,000)	$ 470