Investment in Associated Companies (Tables)

12 Months Ended

Dec. 31, 2020

Investments in Associated Companies [Abstract]

Schedule of Equity Method Investments [Table Text Block]

Year Ended December 31,

2020

2019

2018

Houghton Korea

$

5,241

$

2,337

$

—

Nippon Japan

853

850

713

Kelko Panama

107

55

222

Kelko Venezuela

—

—

(138)

Primex

1,151

1,822

966

Total equity in net income of associated companies

$

7,352

$

5,064

$

1,763