Benefit Plans (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Components of Net Periodic Benefit Cost
Service cost	$ 293	$ 205	$ 586	$ 409	$ 821
Interest cost	271	234	541	468	$ 935
Net loss	107	32	213	64
Net periodic pension cost	$ 671	$ 471	$ 1,340	$ 941