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Benefit Plans Amortization (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Pension Plan [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Amortization of prior service cost $ 376
Amortization of loss 3,920
Total 4,296
Other Postretirement Benefit Plan [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Amortization of prior service cost 197
Amortization of loss 219
Total $ 416