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Fair Value Measurements
6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements
Under applicable accounting guidance, fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.
We determine the fair values of our financial instruments based on the fair value hierarchy established under applicable accounting guidance which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs used to measure fair value.
For more information regarding the fair value hierarchy and how we measure fair value, see Note 2–Summary of Significant Accounting Policies to the Consolidated Financial Statements of our Annual Report on Form 10-K for the year ended December 31, 2014.
As of June 30, 2015 and December 31, 2014, our assets and liabilities carried at fair value on a recurring basis were as follows:
 
Level 1
 
Level 2
 
Level 3
 
Total Fair Value
June 30, 2015
(In thousands)
Assets
 
 
 
 
 
 
 
Corporate bonds
$

 
$
36,869

 
$

 
$
36,869

Commercial paper

 
36,788

 

 
36,788

U.S. Treasury notes

 
26,284

 

 
26,284

Mortgage-backed securities

 
79,277

 

 
79,277

Municipal bonds

 
2,188

 

 
2,188

Asset-backed securities

 
17,773

 

 
17,773

Total assets
$

 
$
199,179

 
$

 
$
199,179

 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
Contingent consideration
$

 
$

 
$
14,976

 
$
14,976

 
 
 
 
 
 
 
 
December 31, 2014
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
Corporate bonds
$

 
$
40,389

 
$

 
$
40,389

Commercial paper

 
7,649

 

 
7,649

U.S. Treasury notes

 
14,771

 

 
14,771

Agency securities

 
2,950

 

 
2,950

Mortgage-backed securities

 
35,362

 

 
35,362

Municipal bonds

 
5,595

 

 
5,595

Asset-backed securities

 
13,715

 

 
13,715

Total assets
$

 
$
120,431

 
$

 
$
120,431

 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
Contingent consideration
$

 
$

 
$
23,160

 
$
23,160



The following table presents changes in our contingent consideration payable for the three and six months ended June 30, 2015, which is categorized in Level 3 of the fair value hierarchy.
 
Three Months Ended June 30, 2015
 
Six Months Ended June 30, 2015
 
(In thousands)
Balance, beginning of period
$
15,375

 
$
23,160

Payments of contingent consideration
(499
)
 
(668
)
Change in fair value of contingent consideration
100

 
(7,516
)
Balance, end of period
$
14,976

 
$
14,976


Note 12—Fair Value Measurements (continued)
We based the fair value of our fixed income securities held as of June 30, 2015 and December 31, 2014 on quoted prices in active markets for similar assets. We had no transfers between Level 1, Level 2 or Level 3 assets during the three and six months ended June 30, 2015 or 2014.