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Benefit Plans (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive (income) loss      
Total recognized in accumulated other comprehensive income (loss) $ 454 $ 898 $ 250
Pension Plans, Defined Benefit [Member]
      
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive (income) loss      
Net loss 456 902 378
Amortization of prior service cost (2) (4) (3)
Amortization of net obligation at transition     4
Total recognized in accumulated other comprehensive income (loss) 454 898 379
Total Recognized in Net Periodic Benefit Cost and Accumulated Other Comprehensive Income (Loss) $ 963 $ 1,476 $ 677