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Investments in debt and equity securities (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019
 
December 31, 2018
 
Debt
securities
 
Equity
securities
 
Total
 
Debt
securities
 
Equity
securities
 
Total
Certificates of deposit and other time deposits
$
2,235

 
$
—

 
$
2,235

 
$
2,235

 
$
—

 
$
2,235

Investments in mutual funds and common stock
—

 
36,214

 
36,214

 
—

 
36,124

 
36,124

 
$
2,235

 
$
36,214

 
$
38,449

 
$
2,235

 
$
36,124

 
$
38,359

Short-term investments
$
2,235

 
$
1,800

 
$
4,035

 
$
2,235

 
$
700

 
$
2,935

Long-term investments
—

 
34,414

 
34,414

 
—

 
35,424

 
35,424

 
$
2,235

 
$
36,214

 
$
38,449

 
$
2,235

 
$
36,124

 
$
38,359