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Hourglass Sands (Condensed Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Business Acquisition [Line Items] |  |
Current assets | $ 84,978 | $ 67,686
Total assets | 515,499 | 518,193
Total liabilities | 256,625 | 268,870
Total liabilities , redeemable noncontrolling interests, and stockholders' equity | 515,499 | $ 518,193
Hourglass Sands LLC [Member] |  |
Business Acquisition [Line Items] |  |
Current assets | 4,241 |
Property and equipment | 3,092 |
Total assets | 7,333 |
Total liabilities | 502 |
Redeemable noncontrolling interests | 4,000 |
Members' equity | 2,831 |
Total liabilities , redeemable noncontrolling interests, and stockholders' equity | $ 7,333 |

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