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Fair Value Measurements | 3 Months Ended
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Mar. 31, 2017
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, 2016. Note 13—Fair Value Measurements (continued) As of March 31, 2017 and December 31, 2016, our assets and liabilities carried at fair value on a recurring basis were as follows:
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
March 31, 2017 | (In thousands)
Assets |  |  |  |  |  |  |
Corporate bonds | $ | — |  |  | $ | 12,059 |  |  | $ | — |  |  | $ | 12,059 |
Commercial paper | — |  |  | 3,885 |  |  | — |  |  | 3,885 |
U.S. Treasury notes | — |  |  | 25,837 |  |  | — |  |  | 25,837 |
Mortgage-backed securities | — |  |  | 112,377 |  |  | — |  |  | 112,377 |
Municipal bonds | — |  |  | 1,288 |  |  | — |  |  | 1,288 |
Asset-backed securities | — |  |  | 28,363 |  |  | — |  |  | 28,363 |
Total assets | $ | — |  |  | $ | 183,809 |  |  | $ | — |  |  | $ | 183,809 |
Liabilities |  |  |  |  |  |  |
Contingent consideration | $ | — |  |  | $ | — |  |  | $ | 26,442 |  |  | $ | 26,442 |
December 31, 2016 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Corporate bonds | $ | — |  |  | $ | 21,535 |  |  | $ | — |  |  | $ | 21,535 |
Commercial paper | — |  |  | 12,430 |  |  | — |  |  | 12,430 |
U.S. Treasury notes | — |  |  | 21,563 |  |  | — |  |  | 21,563 |
Agency securities | — |  |  | 4,001 |  |  | — |  |  | 4,001 |
Mortgage-backed securities | — |  |  | 117,491 |  |  | — |  |  | 117,491 |
Municipal bonds | — |  |  | 1,430 |  |  | — |  |  | 1,430 |
Asset-backed securities | — |  |  | 29,976 |  |  | — |  |  | 29,976 |
Total assets | $ | — |  |  | $ | 208,426 |  |  | $ | — |  |  | $ | 208,426 |
Liabilities |  |  |  |  |  |  |
Contingent consideration | $ | — |  |  | $ | — |  |  | $ | 8,634 |  |  | $ | 8,634 |
We based the fair value of our fixed income securities held as of March 31, 2017 and December 31, 2016 on quoted prices in active markets for similar assets. We had no transfers between Level 1, Level 2 or Level 3 assets or liabilities during the three months ended March 31, 2017 or 2016. The following table presents changes in our contingent consideration payable for the three months ended March 31, 2017 and 2016, which is categorized in Level 3 of the fair value hierarchy:
| Three Months Ended March 31,
| 2017 |  | 2016
Balance, beginning of period | $ | 8,634 |  |  | $ | 13,889 |
Issuance | 18,000 |  |  | — |
Payments of contingent consideration | (192 | ) |  | (189 | )
Balance, end of period | $ | 26,442 |  |  | $ | 13,700 |

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13504-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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