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Benefit Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Components of Net Periodic Benefit Cost          
Service cost $ 205 $ 231 $ 409 $ 462 $ 925
Interest cost 234 207 468 415 829
Amortization of prior service cost 0    0 0  
Net loss 64 66 64 131  
Net periodic pension cost $ 503 $ 504 $ 941 $ 1,008