Benefit Plans (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Components of Net Periodic Benefit Cost
Service cost	$ 249	$ 293	$ 497	$ 586	$ 1,173
Interest cost	289	271	578	541	$ 1,082
Net loss	53	107	107	213
Net periodic pension cost	$ 591	$ 671	$ 1,182	$ 1,340