Pension Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	May 31, 2014
Pension Plan
Discount rate used to re-measure pension obligation (as a percent)					4.46%
Components of net periodic pension cost
Interest cost	$ 92	$ 78	$ 184	$ 157
Expected return on plan assets	(83)	(79)	(165)	(158)
Amortization of Net Actuarial Loss	59	64	118	128
Net periodic pension cost	68	63	137	127
Contributions paid	$ 40	$ 36	$ 80	$ 72