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Investments in Debt and Equity Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
The Company’s investments in these securities and certain other financial instruments consist of the following: 
 
December 31, 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
$
42,316

 
$
—

 
$
42,316

 
$
255,781

 
$
—

 
$
255,781

Investments in mutual funds and common stock
—

 
38,895

 
38,895

 
50,000

 
31,197

 
81,197

 
$
42,316

 
$
38,895

 
$
81,211

 
$
305,781

 
$
31,197

 
$
336,978

Short-term investments
$
42,316

 
$
1,200

 
$
43,516

 
$
305,781

 
$
1,200

 
$
306,981

Long-term investments
—

 
37,695

 
37,695

 
—

 
29,997

 
29,997

 
$
42,316

 
$
38,895

 
$
81,211

 
$
305,781

 
$
31,197

 
$
336,978