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Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Income taxes receivable	$ 17,100,000	$ 22,500,000
Estimate for full expense on certain assets and executive compensation limitation	15,800,000	32,900,000
Valuation allowance	(1,100,000)	(600,000)
Valuation allowance increase	500,000
State operating loss carryforwards	3,000,000
Unrecognized tax benefits	0	$ 0	$ 0
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Valuation allowance, state net operating loss carryforwards	1,100,000
State tax credit carryforward	$ 400,000

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Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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