Defined Benefit Pension Plan (Net Pension Cost (Credit)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Pension Plan [Abstract]
Service cost	$ 412	$ 317
Interest cost	412	446
Expected return on plan assets	(889)	(750)
Amortization of net actuarial loss		88
Net pension cost (credit)	$ (65)	$ 101