Benefit Plans (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Components of Net Periodic Benefit Cost
Service cost	$ 249	$ 293	$ 746	$ 860	$ 1,173
Interest cost	289	271	866	812	$ 1,082
Net loss	53	107	160	320
Net periodic pension cost	$ 591	$ 671	$ 1,772	$ 1,992