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Investments in debt and equity securities (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Investments
The Company’s short-term and long-term debt and equity investments consist of the following:
 
June 30, 2020
 
December 31, 2019
 
Debt
securities
 
Equity
securities
 
Total
 
Debt
securities
 
Equity
securities
 
Total
Certificates of deposit and other time deposits
$
143,059

 
$
—

 
$
143,059

 
$
8,140

 
$
—

 
$
8,140

Investments in mutual funds and common stock
—

 
39,396

 
39,396

 
—

 
39,951

 
39,951

 
$
143,059

 
$
39,396

 
$
182,455

 
$
8,140

 
$
39,951

 
$
48,091

Short-term investments
$
143,059

 
$
11,056

 
$
154,115

 
$
8,140

 
$
3,432

 
$
11,572

Long-term investments
—

 
28,340

 
28,340

 
—

 
36,519

 
36,519

 
$
143,059

 
$
39,396

 
$
182,455

 
$
8,140

 
$
39,951

 
$
48,091