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Benefit Plans Amounts Recognized in Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent liabilities $ 73,425 $ 68,855
Pension Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Current liabilities 737 705
Noncurrent liabilities 64,720 60,436
Liabilities 65,457 61,141
Other Postretirement Benefit Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Current liabilities 60 56
Noncurrent liabilities 8,705 8,419
Liabilities $ 8,765 $ 8,475