Income Taxes - Reconciliation of Taxes Computed at the Corporate Federal Income Tax Rate to the Reported Income Tax (provision) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Pre-tax net book income (loss)	$ 10,503	$ 3,454	$ (3,427)
Statutory federal income tax (provision) benefit	(2,206)	(725)	1,165
State income tax (provision) benefit	(397)	(145)	736
Federal statutory depletion	0	0	153
Federal tax rate adjustment	0	0	2,007
Valuation allowance	0	98	(1,038)
Return to provision adjustments	285	388	0
Other	22	(125)	(78)
Total (provision for) benefit from income taxes	$ (2,296)	$ (509)	$ 2,945
Effective income tax rate	22.00%	15.00%	86.00%
Effective income tax rate excluding adjustment		26.00%	58.00%

Effective Income Tax Rate Reconciliation, Excluding Tax Cuts and Jobs Act of 2017, Percent

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Pre-tax Net Book Income (“NBI”)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current tax expense (benefit) and deferred tax expense (benefit) pertaining to income (loss) from continuing operations and income (loss) from discontinued operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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