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Short-term and long-term invesmtents (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
The Company’s investments in these short-term and long-term debt and equity investments consist of the following:
 
December 31, 2019
 
December 31, 2018
 
Debt
securities
 
Equity
securities
 
Total
 
Debt
securities
 
Equity
securities
 
Total
Certificates of deposit and other time deposits
$
8,140

 
$
—

 
$
8,140

 
$
2,235

 
$
—

 
$
2,235

Investments in mutual funds and common stock
—

 
39,951

 
39,951

 
—

 
36,124

 
36,124

 
$
8,140

 
$
39,951

 
$
48,091

 
$
2,235

 
$
36,124

 
$
38,359

Short-term investments
$
8,140

 
$
3,432

 
$
11,572

 
$
2,235

 
$
700

 
$
2,935

Long-term investments
—

 
36,519

 
36,519

 
—

 
35,424

 
35,424

 
$
8,140

 
$
39,951

 
$
48,091

 
$
2,235

 
$
36,124

 
$
38,359