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Investments in debt and equity securities (Tables)
 3 Months Ended
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Investments
The Company’s short-term and long-term debt and equity investments consist of the following:
 
March 31, 2020
 
December 31, 2019
 
Debt
securities
 
Equity
securities
 
Total
 
Debt
securities
 
Equity
securities
 
Total
Certificates of deposit and other time deposits
$
8,190

 
$
—

 
$
8,190

 
$
8,140

 
$
—

 
$
8,140

Investments in mutual funds and common stock
—

 
35,843

 
35,843

 
—

 
39,951

 
39,951

 
$
8,190

 
$
35,843

 
$
44,033

 
$
8,140

 
$
39,951

 
$
48,091

Short-term investments
$
8,190

 
$
1,186

 
$
9,376

 
$
8,140

 
$
3,432

 
$
11,572

Long-term investments
—

 
34,657

 
34,657

 
—

 
36,519

 
36,519

 
$
8,190

 
$
35,843

 
$
44,033

 
$
8,140

 
$
39,951

 
$
48,091