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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Pre-tax net book income (loss)	$ 3,454	$ (3,427)	$ 4,434
Statutory federal income tax (provision) benefit	(725)	1,165	(1,552)
State income tax (provision) benefit	(145)	736	(387)
Federal statutory depletion	0	153	62
Federal tax rate adjustment	0	2,007	0
Valuation allowance	98	(1,038)	0
Return to provision adjustments	388	0	0
Other	(125)	(78)	(44)
Total (provision for) benefit from income taxes	$ (509)	$ 2,945	$ (1,921)
Effective income tax rate	15.00%	86.00%	43.00%
Pre-tax losses from investments in unconsolidated affiliates			$ 2,200
Effective income tax rate excluding adjustment		58.00%
Return to provision adjustments	26.00%

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

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Loss from Equity Method Investments, before Tax

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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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Percentage 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 revisions of previously reported income tax expense.

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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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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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