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Benefit Plans (Details 1) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Components of Net Periodic Benefit Cost          
Service cost $ 293 $ 307 $ 860 $ 613 $ 821
Interest cost 271 351 812 701 $ 935
Net loss 107 31 320 95  
Net periodic pension cost $ 671 $ 689 $ 1,992 $ 1,409