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Investments in debt and equity securities (Tables)
 12 Months Ended
Dec. 31, 2015
Investments Debt And Equity Securities [Abstract]  
Investments

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

 

 

 

December 31, 2015

 

 

December 31, 2014

 

 

 

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

 

$

406,884

 

 

$

—

 

 

$

406,884

 

 

$

335,975

 

 

$

—

 

 

$

335,975

 

Investments in mutual funds and common stock

 

 

—

 

 

 

33,482

 

 

 

33,482

 

 

 

—

 

 

 

28,123

 

 

 

28,123

 

 

 

$

406,884

 

 

$

33,482

 

 

$

440,366

 

 

$

335,975

 

 

$

28,123

 

 

$

364,098

 

Short-term investments

 

$

406,884

 

 

$

1,200

 

 

$

408,084

 

 

$

335,975

 

 

$

1,424

 

 

$

337,399

 

Long-term investments

 

 

—

 

 

 

32,282

 

 

 

32,282

 

 

 

—

 

 

 

26,699

 

 

 

26,699

 

 

 

$

406,884

 

 

$

33,482

 

 

$

440,366

 

 

$

335,975

 

 

$

28,123

 

 

$

364,098