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Employee Benefit Plans (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
Pension Plans Defined Benefit Member
        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Service Cost $ 2,196 $ 1,597 $ 3,728 $ 3,012
Defined Benefit Plan Interest Cost 1,090 1,052 2,070 1,942
Defined Benefit Plan Expected Return On Plan Assets 799 825 1,533 1,469
Defined Benefit Plan Amortization Of Prior Service Cost Credit 87 94 186 101
Defined Benefit Plan Amortization Of Gains Losses (1,388) (314) (1,663) (502)
Total 3,962 2,232 6,114 4,088
Other Postretirement Benefit Plans Defined Benefit Member
        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Service Cost 279 212 558 424
Defined Benefit Plan Interest Cost 258 221 517 441
Defined Benefit Plan Expected Return On Plan Assets 0 0 0 0
Defined Benefit Plan Amortization Of Prior Service Cost Credit 0 0 0 0
Defined Benefit Plan Amortization Of Gains Losses (89) (59) (177) (118)
Total $ 626 $ 492 $ 1,252 $ 983