Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Limit on annual basis	$ 1,200,000
Provision for federal income taxes	0
Undistributed earnings	23,600,000
Tansition tax provisions and other provisions of the internal revenue code	21,700,000
Accrued interest (less than)	100,000	$ 100,000
Penalties accrued	0	$ 0
Corporate tax rate		35.00%
Net expense for one-time transition tax	800,000
Net expense for revaluation of deferred tax assets and liabilities	800,000
Net tax benefit related to pension contributions	1,200,000
Income tax expense benefit favorable return adjustment to provision	$ 500,000
Scenario, Plan
Tax Credit Carryforward [Line Items]
Corporate tax rate	21.00%
State Tax Credits
Tax Credit Carryforward [Line Items]
Remaining tax credit carryforward	$ 300,000