| **Segment Data - Operating Results for Reportable Segments (Details) - USD ($) $ in Thousands** | 3 Months Ended | 9 Months Ended |
|-------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Revenues**                                                                                    |           |           |   |   |
| Total revenues                                                                                  | $ 198,498      | $ 219,853      | $ 581,784 | $ 590,435 |
| **Operating income (loss)**                                                                     |           |           |   |   |
| Total operating income (loss)                                                                   | 13,247         | (21,310)       | 29,268 | (26,560) |
| Fluids Systems                                                                                  |           |           |   |   |
| **Revenues**                                                                                    |           |           |   |   |
| Total revenues                                                                                  | 141,236        | 168,621        | 420,591 | 454,896 |
| Fluids Systems | Disposed of by sale                                                            |           |           |   |   |
| **Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]**   |           |           |   |   |
| Revenues                                                                                        | 0              | 26,214         | 0 | 62,765 |
| Operating income (loss)                                                                         | (358)          | (32,043)       | (4,776) | (36,653) |
| Fluids Systems | Disposed of by sale | Excalibar                                                |           |           |   |   |
| **Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]**   |           |           |   |   |
| Revenues                                                                                        | 0              | 17,623         | 0 | 44,068 |
| Operating income (loss)                                                                         | 0              | 888            | 0 | 2,538 |
| Fluids Systems | Disposed of by sale | Gulf of Mexico                                           |           |           |   |   |
| **Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]**   |           |           |   |   |
| Revenues                                                                                        | 0              | 8,591          | 0 | 18,697 |
| Operating income (loss)                                                                         | (358)          | (32,931)       | (4,776) | (39,191) |
| Industrial Solutions                                                                            |           |           |   |   |
| **Revenues**                                                                                    |           |           |   |   |
| Total revenues                                                                                  | 57,262         | 51,232         | 161,193 | 135,539 |
| Operating segments | Fluids Systems                                                             |           |           |   |   |
| **Revenues**                                                                                    |           |           |   |   |
| Total revenues                                                                                  | 141,236        | 168,621        | 420,591 | 454,896 |
| **Operating income (loss)**                                                                     |           |           |   |   |
| Total operating income (loss)                                                                   | 7,573          | (24,193)       | 13,004 | (20,394) |
| Operating segments | Industrial Solutions                                                       |           |           |   |   |
| **Revenues**                                                                                    |           |           |   |   |
| Total revenues                                                                                  | 57,262         | 51,232         | 161,193 | 135,539 |
| **Operating income (loss)**                                                                     |           |           |   |   |
| Total operating income (loss)                                                                   | 14,336         | 10,036         | 41,593 | 26,148 |
| Operating segments | Industrial Blending                                                        |           |           |   |   |
| **Revenues**                                                                                    |           |           |   |   |
| Total revenues                                                                                  | 0              | 0              | 0 | 0 |
| **Operating income (loss)**                                                                     |           |           |   |   |
| Total operating income (loss)                                                                   | 0              | (526)          | 0 | (10,324) |
| Corporate office                                                                                |           |           |   |   |
| **Operating income (loss)**                                                                     |           |           |   |   |
| Total operating income (loss)                                                                   | $ (8,662)      | $ (6,627)      | $ (25,329) | $ (21,990) |

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The net result for the period of deducting operating expenses from operating revenues.
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