Employee Benefit Plans (Postretirement Health Coverage and Life Insurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 1,287	$ 1,344
Change in projected benefit obligation
Projected benefit obligation at beginning of year	1,344	1,423
Interest cost	50	44	$ 68
Actuarial loss	11	37
Benefits paid	(118)	(160)
Projected benefit obligation at end of year	1,287	1,344	$ 1,423
Change in plan assets
Employer contributions	118	160
Benefits paid	(118)	(160)
Fair value of plan assets at end of year	0	0
Funded Status	$ (1,287)	$ (1,344)
Weighted-average assumptions
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.20%	3.96%
Amounts recognized in the statement of financial position consist of:
Other current liabilities	$ (132)	$ (147)
Other long-term liabilities	(1,155)	(1,197)
Net amount recognized	(1,287)	(1,344)
Pension Plan
Change in plan assets
Fair value of plan assets at end of year	$ 16,912	$ 14,850