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Investments in debt and equity securities and other investments (Tables)
 3 Months Ended
Mar. 31, 2016
Investments Debt And Equity Securities [Abstract]  
Investments

The Company’s investments in securities consist of the following:

 

 

 

March 31, 2016

 

 

December 31, 2015

 

 

 

Held to

 

 

Available

 

 

 

 

 

 

Held to

 

 

Available

 

 

 

 

 

 

 

maturity

 

 

for sale

 

 

Total

 

 

maturity

 

 

for sale

 

 

Total

 

Certificates of deposit, commercial paper and money

   market funds due within one year

 

$

382,399

 

 

$

—

 

 

$

382,399

 

 

$

406,884

 

 

$

—

 

 

$

406,884

 

Investments in mutual funds, debt securities and

   common stock

 

 

—

 

 

 

48,667

 

 

 

48,667

 

 

—

 

 

 

33,482

 

 

 

33,482

 

 

 

$

382,399

 

 

$

48,667

 

 

$

431,066

 

 

$

406,884

 

 

$

33,482

 

 

$

440,366

 

Short-term investments

 

$

382,399

 

 

$

14,069

 

 

$

396,468

 

 

$

406,884

 

 

$

1,200

 

 

$

408,084

 

Long-term investments

 

 

—

 

 

 

34,598

 

 

 

34,598

 

 

 

—

 

 

 

32,282

 

 

 

32,282

 

 

 

$

382,399

 

 

$

48,667

 

 

$

431,066

 

 

$

406,884

 

 

$

33,482

 

 

$

440,366