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Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Pension Plans, Defined Benefit [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 7,596 $ 4,319
Interest cost 3,980 4,131
Expected return on plan assets (5,538) (5,468)
Amortization of prior service cost (credit) (36) 47
Amortization of other actuarial (gains) losses 3,571 2,140
Net benefit cost (credit) 9,573 5,169
Other Postretirement Benefit Plans, Defined Benefit [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Service cost 549 405
Interest cost 491 498
Amortization of prior service cost (credit) (2,995) (591)
Amortization of other actuarial (gains) losses (90) (598)
Net benefit cost (credit) $ (2,045) $ (287)