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Componenets of Net Periodic Pension Costs (Schedule of Net Periodic Pension Cost) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Components of Net Periodic Pension Cost [Abstract]        
Interest cost $ 135 $ 147 $ 278 $ 294
Net amortization and deferral (12) (50) (42) (100)
Net periodic pension cost $ 123 $ 97 $ 236 $ 194