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Investments
9 Months Ended
Sep. 30, 2015
Available-for-sale Securities [Abstract]  
Investments
Investments
 
Marketable securities

The following is a summary of our available-for-sale investment securities, excluding those securities classified within cash and cash equivalents on the consolidated balance sheets (in thousands):
 
 
September 30, 2015
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Available-for-sale securities:
 
 
 
 
 
 
 
Commercial paper
$
11,356

 
$
9

 
$

 
$
11,365

Corporate notes and bonds
618,988

 
85

 
(990
)
 
618,083

Certificates of deposit
41,055

 
21

 
(3
)
 
41,073

U.S. government agency securities
109,735

 
134

 

 
109,869

Total available-for-sale securities
$
781,134

 
$
249

 
$
(993
)
 
$
780,390

 
 
December 31, 2014
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Available-for-sale securities:
 
 
 
 
 
 
 
Commercial paper
$
8,195

 
$
1

 
$

 
$
8,196

Corporate notes and bonds
554,421

 
56

 
(845
)
 
553,632

Certificates of deposit
27,251

 
8

 
(2
)
 
27,257

U.S. government agency securities
94,093

 
2

 
(72
)
 
94,023

Total available-for-sale securities
$
683,960

 
$
67

 
$
(919
)
 
$
683,108



As of September 30, 2015, the contractual maturities of our investments did not exceed 24 months. The fair values of available-for-sale investments, by remaining contractual maturity, are as follows (in thousands):
 
September 30, 2015
Due in 1 year or less
$
379,878

Due in 1 year through 2 years
400,512

Total
$
780,390


    
We had certain available-for-sale securities in a gross unrealized loss position, substantially all of which had been in such position for less than 12 months. There were no impairments considered "other-than-temporary" as it is more likely than not we will hold the securities until maturity or a recovery of the cost basis. The following table shows the fair values and the gross unrealized losses of these available-for-sale securities aggregated by investment types (in thousands):
 
 
September 30, 2015
 
December 31, 2014
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Corporate notes and bonds
$
401,772

 
$
(990
)
 
$
436,140

 
$
(845
)
Certificates of deposit
11,802

 
(3
)
 
7,999

 
(2
)
U.S. government agency securities

 

 
80,014

 
(72
)
Total
$
413,574

 
$
(993
)
 
$
524,153

 
$
(919
)


Strategic investment

During the nine months ended September 30, 2015, we purchased a non-marketable equity investment in a privately-held company. This investment is accounted for under the cost method as we have less than a 20% ownership interest and we do not have the ability to exercise significant influence over the operations of the company.  The carrying value of our investment was $10.0 million as of September 30, 2015, which is included in "Other assets" on the condensed consolidated balance sheets. We monitor this non-marketable equity investment for impairment and will make an appropriate reduction in carrying value if we determine that an impairment charge is required based primarily on the financial condition and near-term prospects of the privately-held company.