Other Employee Benefit Plans (Schedule of Long-Term Disability Plan) (Details) - Long-Term Disability - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit costs	$ 1,483	$ 2,088	$ 2,058
Discount rate (as a percent)	3.97%	3.22%	3.43%