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Investments in debt and equity securities (Tables)
 9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Investments
The Company’s investments in these securities and certain other financial instruments consist of the following:
 
September 30, 2017
 
December 31, 2016
 
Held to
maturity
 
Available
for sale
 
Total
 
Held to
maturity
 
Available
for sale
 
Total
Certificates of deposit, commercial paper and
money market funds due within one year
$
136,158

 
$
—

 
$
136,158

 
$
256,827

 
$
—

 
$
256,827

Investments in mutual funds and common stock
—

 
57,089

 
57,089

 
50,000

 
47,404

 
97,404

Cash surrender value of life insurance policies
—

 
64,240

 
64,240

 
—

 
59,646

 
59,646

 
$
136,158

 
$
121,329

 
$
257,487

 
$
306,827

 
$
107,050

 
$
413,877

Short-term investments
$
136,158

 
$
1,200

 
$
137,358

 
$
306,827

 
$
3,371

 
$
310,198

Long-term investments
—

 
120,129

 
120,129

 
—

 
103,679

 
103,679

 
$
136,158

 
$
121,329

 
$
257,487

 
$
306,827

 
$
107,050

 
$
413,877