Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Curtailments			$ 424
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7,310	3,926	14,906	8,245
Interest cost	4,092	3,996	8,072	8,127
Curtailments	324		324
Expected return on plan assets	(5,477)	(5,438)	(11,015)	(10,906)
Amortization of prior service cost (credit)	(37)	(142)	(73)	(95)
Amortization of other actuarial (gains) losses	4,200	2,234	7,771	4,374
Net benefit cost (credit)	10,412	4,576	19,985	9,745
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	539	518	1,088	923
Interest cost	520	529	1,011	1,027
Curtailments	(1,837)		(1,837)
Amortization of prior service cost (credit)	(2,876)	(546)	(5,871)	(1,137)
Amortization of other actuarial (gains) losses	(171)	(952)	(261)	(1,550)
Net benefit cost (credit)	$ (3,825)	$ (450)	$ (5,870)	$ (737)