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Income Taxes - Deferred tax assets and deferred tax liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Property and equipment | $ 28,329 | $ 25,212
Depletion | 721 | 660
Unrealized rents | 52 | 1,166
Prepaid expenses | 38 | 431
Gross deferred tax liabilities | 29,140 | 27,469
Employee benefits and other | 1,159 | 1,487
Gross deferred tax assets | 1,159 | 1,487
Net deferred tax liability | $ 27,981 | $ 25,982

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