CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Operating Costs and Expenses [Abstract] | |||
| Depreciation and amortization included in the cost of specialty petrochemicals, product sales, and processing | $ 15,361 | $ 13,618 | $ 10,089 |
| X | ||||||||||
- Definition Amount of expense for allocation of cost of tangible asset over its useful life directly used in production of good and rendering of service. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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