Defined Benefit Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of components of net periodic pension income
Service cost	$ 245	$ 217	$ 487	$ 434
Interest cost	85	179	169	357
Expected return on plan assets	(396)	(458)	(788)	(915)
Prior service cost amortization	36	36	71	72
Deferred loss amortization	11	0	22	0
Net periodic pension benefit	$ (19)	$ (26)	$ (39)	$ (52)