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Investments in Available-for-Sale Securities
 12 Months Ended
Dec. 31, 2015
Available-for-sale Securities [Abstract]  
Investments in Available-for-Sale Securities
Investments in Available-for-Sale Securities

The Company has invested primarily in highly liquid investment-grade corporate bonds. These investments are held in the custody of a major financial institution. These securities, along with the Company's investments in marketable equity securities, are classified as available-for-sale securities and, accordingly, the unrealized gains and losses are recorded through other comprehensive income.

The Company's investments in available-for-sale marketable securities are as follows:
 
December 31, 2015
 
 
 
 
 
 
 
 
 
Balance Sheet
 
 
 
Gross
 
Gross
 
 
 
Classification
 
 
 
Unrealized
 
Unrealized
 
Fair
 
Short-Term
 
Other
 
Cost Basis
 
Gains
 
Losses
 
Value
 
Investments
 
Assets
 
(In thousands)
Available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency securities
$
10,007

 
$
—

 
$
(12
)
 
$
9,995

 
$
9,995

 
 
Corporate notes and bonds
190,496

 
—

 
(299
)
 
190,197

 
190,197

 
—

Equity securities
3,938

 
668

 
(2,888
)
 
1,718

 
—

 
1,718

Total Investments
$
204,441

 
$
668

 
$
(3,199
)
 
$
201,910

 
$
200,192

 
$
1,718

 
 
 
 
 
 
 
 
 
 
 
 

 
December 31, 2014
 
 
 
 
 
 
 
 
 
Balance Sheet
 
 
 
Gross
 
Gross
 
 
 
Classification
 
 
 
Unrealized
 
Unrealized
 
Fair
 
Short-Term
 
Other
 
Cost Basis
 
Gains
 
Losses
 
Value
 
Investments
 
Assets
 
(In thousands)
Available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
Corporate notes and bonds
$
253,590

 
$
—

 
$
(4,636
)
 
$
248,954

 
$
248,954

 
$
—

Equity securities
3,910

 
4,125

 
(2,890
)
 
5,145

 
—

 
5,145

Total Investments
$
257,500

 
$
4,125

 
$
(7,526
)
 
$
254,099

 
$
248,954

 
$
5,145

 
 
 
 
 
 
 
 
 
 
 
 

The aggregate fair value of investments with unrealized losses that had been owned for less than a year was $184.6 million and $163.0 million at December 31, 2015 and 2014, respectively. The aggregate fair value of investments with unrealized losses that have been owned for over a year was $15.8 million and $86.1 million at December 31, 2015 and 2014, respectively.

The debt securities outstanding at December 31, 2015 have maturity dates ranging from the first quarter of 2016
through the second quarter of 2017. The Company classifies its investments as current based on the nature of the investments and their availability to provide cash for use in current operations, if needed.