Pension Plan (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	May 31, 2014
Pension Plan
Discount rate used to re-measure pension obligation (as a percent)						4.46%
Adjustment to pension cost resulting from freezing of plan		$ 213
Expected reduction to pension cost in second half of 2014 due to freezing of plan	430			430
Components of net periodic pension cost
Service cost			163	346	489
Interest cost	76		62	231	186
Expected return on plan assets	(81)		(68)	(239)	(204)
Amortization of net actuarial loss	33		47	103	140
Amortization of prior service costs					1
Net periodic pension cost	28		204	441	612
Contributions paid	$ 157		$ 155	$ 345	$ 325