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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2013
Fair Value Measurements  
Schedule of assets and liabilities measured on a recurring basis, at fair value

The major categories of assets and liabilities measured on a recurring basis, at fair value, as of December 31, 2013 and 2012 are as follows (in thousands):

 

 

 

December 31, 2013

 

 

 

Level 1

 

Level 2

 

Level 3

 

Total

 

U.S. treasuries

 

$

130,977

 

$

 

$

 

$

130,977

 

Corporate debt

 

 

77,601

 

 

77,601

 

Government agency securities

 

 

61,013

 

 

61,013

 

Commercial paper

 

 

11,947

 

 

11,947

 

Derivative instrument

 

 

907

 

 

907

 

Contingent consideration

 

 

 

(29,368

)

(29,368

)

 

 

 

December 31, 2012 (1)

 

 

 

Level 1

 

Level 2

 

Level 3

 

Total

 

U.S. treasuries

 

$

278,698

 

$

 

$

 

$

278,698

 

Government agency securities

 

 

123,054

 

 

123,054

 

Derivative instrument

 

 

248

 

 

248

 

 

(1)         December 31, 2012 table has been conformed to present year presentation.

Schedule of the reconciliation of the amount in Level 3

A reconciliation of the amount in Level 3 is as follows (in thousands):

 

 

 

Level 3

 

Balance at December 31, 2012

 

$

 

Addition of contingent consideration

 

(33,539

)

Payment on contingent consideration

 

5,000

 

Fair value adjustment of contingent consideration

 

(829

)

Balance at December 31, 2013

 

$

(29,368

)