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Invesments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments  
Schedule of available-for-sale securities

 

 

 

 

 

 

 

 

Gross

 

 

 

Gross

 

 

 

 

 

 

 

 

 

Amortized

 

 

 

Unrealized

 

 

 

Unrealized

 

 

 

Estimated

 

 

 

 

 

Cost

 

 

 

Gains

 

 

 

Losses

 

 

 

Fair Value

 

 

 

 

 

(in thousands)

 

December 31, 2015

 

 

 

 

 

 

 

 

 

U.S. treasuries

 

$
94,935

 

$
6

 

$
(23

)

$
94,918

 

Government agency securities

 
12,985

 
3

 

—

 
12,988

 

Corporate debt

 
8,144

 
1

 
(1

)
8,144

 

 

 

 

 

 

 

 

 

 

 

Total available-for-sale securities

 

$
116,064

 

$
10

 

$
(24

)

$
116,050

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2014

 

 

 

 

 

 

 

 

 

U.S. treasuries

 

$
81,506

 

$
27

 

$
(6

)

$
81,527

 

Corporate debt

 
39,031

 
20

 
(6

)
39,045

 

 

 

 

 

 

 

 

 

 

 

Total available-for-sale securities

 

$
120,537

 

$
47

 

$
(12

)

$
120,572

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Schedule of available-for-sale securities in a loss position

 

 

 

 

December 31, 2015

 

 

 

December 31, 2014

 

 

 

 

 

 

 

 

 

Gross

 

 

 

 

 

 

 

Gross

 

 

 

 

 

Estimated

 

 

 

Unrealized

 

 

 

Estimated

 

 

 

Unrealized

 

 

 

 

 

Fair Value

 

 

 

Losses

 

 

 

Fair Value

 

 

 

Losses

 

 

 

(in thousands)

 

U.S. treasuries

 

$
64,922

 

$
(23

)

$
35,001

 

$
(6

)

Corporate debt

 
3,353

 
(1

)
13,069

 
(6

)

 

 

 

 

 

 

 

 

 

 

Total

 

$
68,275

 

$
(24

)

$
48,070

 

$
(12

)