Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Inventory [Line Items]
Raw materials	$ 105,713	$ 105,289
Total inventories	139,913	147,857
Fluids systems
Inventory [Line Items]
Raw materials	99,223	98,974
Industrial Solutions
Inventory [Line Items]
Raw materials	6,490	6,315
Blended fluids systems components
Inventory [Line Items]
Finished goods	30,415	31,744
Finished goods - mats
Inventory [Line Items]
Finished goods	$ 3,785	$ 10,824

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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