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Hourglass Sands (Condensed Statement of Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |
Revenue | $ 293,557 | $ 271,633
Expenses | 290,011 | 257,751
Net income | 7,621 | $ 33,076
Hourglass Sands LLC [Member] |  |
Business Acquisition [Line Items] |  |
Revenue | 255 |
Expenses | 1,424 |
Net income | $ (1,169) |

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