Pension Plans (Details 2) - Pension Benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of net periodic benefit cost
Service cost	$ 177	$ 227	$ 198
Interest cost	947	970	882
Expected return on plan assets	(1,282)	(1,251)	(1,114)
Recognized actuarial loss	798	269	767
Amortization of prior service cost	8	8	8
Total net periodic benefit cost	$ 648	$ 223	$ 741