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Investment in Associated Companies (Tables)
 12 Months Ended
Dec. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]  
Equity Method Investments
The following table is a summary of equity income in associated companies by investment for the years ending December 31, 2022, 2021 and 2020:
Year Ended December 31,
202220212020
Houghton Korea$2,644 $3,808 $5,241 
Nippon Japan323 461 853 
Kelko Panama425 154 107 
Grindaix (1)— (37)— 
Primex(1,427)4,993 1,151 
Total equity in net income of associated companies$1,965 $9,379 $7,352 
(1)In February 2021, the Company acquired a 38% ownership interest in Grindaix. From that date through September 2021 when the Company purchased the remaining interest of Grindaix, the Company accounted for its 38% interest under the equity method of accounting and recorded equity in net income of associated companies. See Note 2 of Notes to Consolidated Financial Statements.