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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Investments Debt And Equity Securities [Abstract]  
Schedule of Marketable Securities

 

 

Fair value

measurement

level

 

Market

value

 

 

Cost basis

 

 

Unrealized

gain

 

 

 

 

(In thousands)

 

December 31, 2017

 

 

 

 

 

 

 

 

 

 

 

 

 

Valhi common stock

1

 

$

88,681

 

 

$

24,347

 

 

$

64,334

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

September 30, 2018

 

 

 

 

 

 

 

 

 

 

 

 

 

Valhi common stock

1

 

$

32,770

 

 

$

24,347

 

 

$

8,423