Defined Benefit Plan (Schedule of Net Periodic Pension Cost (Benefit))(Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of net periodic pension cost (benefit)
Service cost	$ 241	$ 290
Interest cost	56	61
Expected return on plan assets	(247)	(291)
Prior service cost amortization	36	37
Deferred loss amortization	0	60
Net periodic pension cost	$ 86	$ 157