Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Company plan contributions	$ 700	$ 569	$ 445
Unrecognized prior service cost reduction	$ 1,100
Assumed health care cost trend rate	5.60%
Ultimate health care cost trend rate	4.60%
Year that plan rate reaches ultimate health care cost trend rate	2066
Discount rate used to determine year-end expense	3.90%	3.30%	3.30%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to determine year-end expense	4.00%