| Goodwill and Other Intangible Assets - Narratives (Details) $ in Thousands | 12 Months Ended | ||
|---|---|---|---|
| Dec. 31, 2020  USD ($) | Dec. 31, 2019  USD ($) | Dec. 31, 2018  USD ($) | |
| Goodwill | |||
| Number of reporting units | 3 | ||
| Goodwill impairment charge | $ 260,000 | $ 0 | $ 0 | 
| Goodwill | 717,738 | 973,578 | 969,674 | 
| Amortization expense | 26,923 | 26,888 | 27,258 | 
| Performance Chemicals | |||
| Goodwill | |||
| Goodwill impairment charge | 260,000 | ||
| Goodwill | 326,173 | 583,075 | 580,023 | 
| Cost of goods sold | |||
| Goodwill | |||
| Amortization expense | 9,369 | 13,877 | 13,579 | 
| Other operating expenses | |||
| Goodwill | |||
| Amortization expense | $ 26,923 | $ 26,888 | $ 27,258 | 
| X | ||||||||||
| 
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
 | 
| X | ||||||||||
| 
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
 | 
| X | ||||||||||
| 
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
 | 
| X | ||||||||||
| 
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
 | 
| X | ||||||||||
| 
- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. No definition available. 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 |