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Employee Benefit Plans Employee Benefit Plans (Schedule of Net Benefit Costs) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Plans, Defined Benefit [Member]
     
Defined benefit costs [Line Items]      
Service cost $ 27,466 $ 16,490 $ 15,870
Interest cost 15,668 16,253 15,822
Recognized Net Gain (Loss) Due to Curtailments 324    0
Expected return on plan assets 22,030 21,812 19,392
Amortization of prior service cost (credit) 259 (189) 173
Amortization of other actuarial losses (gains) (14,666) (8,748) (7,130)
Total net benefit 36,353 19,490 19,603
Other Postretirement Benefit Plans, Defined Benefit [Member]
     
Defined benefit costs [Line Items]      
Service cost 2,142 3,917 1,509
Interest cost 2,020 3,279 2,083
Recognized Net Gain (Loss) Due to Curtailments (4,049) 0 0
Expected return on plan assets 0 0 0
Amortization of prior service cost (credit) (11,458) (2,364) (2,364)
Amortization of other actuarial losses (gains) 522 3,100 2,918
Total net benefit $ (11,867) $ 1,732 $ (1,690)