Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Periodic Pension Cost [Abstract]
Interest cost	$ 111	$ 128
Amortization of net loss	35	28
Expected return on plan assets	(162)	(161)
Net periodic pension cost	(16)	(5)
Contributed amount