Defined Benefit Plan (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of components of net periodic pension income
Service cost	$ 239	$ 211	$ 726	$ 645
Interest cost	83	174	251	532
Expected return on plan assets	(386)	(446)	(1,175)	(1,361)
Prior service cost amortization	34	35	105	107
Deferred loss amortization	11	0	33	0
Net periodic pension benefit	$ (19)	$ (26)	$ (60)	$ (77)