Pension - Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Components of net periodic benefit cost:
Interest cost	$ 15	$ 15
Service cost	6	6
Expected return on plan assets	(23)	(23)
Amortization of prior service costs	2	2
Amortization of actuarial loss	28	31
Net periodic benefit cost	$ 28	$ 31