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Benefit Plans Benefits Expected to be Paid in Next Five Years (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Pension Plan [Member]
 
Expected Future Benefit Payments [Abstract]  
2013 $ 4,523
2014 4,697
2015 4,914
2016 5,185
2017 5,458
2018 - 2022 31,438
Other Postretirement Benefit Plan [Member]
 
Expected Future Benefit Payments [Abstract]  
2013 416
2014 441
2015 475
2016 511
2017 544
2018 - 2022 3,193
Maximum [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Estimated required and discretionary employer cash contributions in 2013 $ 10,300