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Commitments - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Commitments [Line Items] |  |  |
Maximum annual contributions per employee (401K Plan) | 100.00% |  |
Cost recognized on defined contribution plan | $ 2,900,000 | $ 2,600,000 | $ 3,000,000.0
Minimum |  |  |
Commitments [Line Items] |  |  |
Minimum matching employer contribution for 401K | 3.00% |  |
Supply agreement non-utilization fees | Muskie Proppant LLC |  |  |
Commitments [Line Items] |  |  |
Non-utilization fees incurred | $ 3,500,000 | $ 2,200,000 | $ 0

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