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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Summary Of Assets And Liabilities Measured At Fair Value On Recurring Basis | Assets and liabilities measured at fair value on a recurring basis are summarized below:
| Fair Value Measurements as of March 31, 2018
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Description |  |  |  |  |  |  |
Cash equivalents (a) | $ | 40,891 |  |  | $ | — |  |  | $ | — |  |  | $ | 40,891 |
Earnout consideration (b) | $ | — |  |  | $ | — |  |  | $ | 2,556 |  |  | $ | 2,556 |
﻿ |  |  |  |  |  |  |
| Fair Value Measurements as of December 31, 2017
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Description |  |  |  |  |  |  |
Cash equivalents (a) | $ | 20,244 |  |  | $ | — |  |  | $ | — |  |  | $ | 20,244 |
Earnout consideration (b) | $ | — |  |  | $ | — |  |  | $ | 5,115 |  |  | $ | 5,115 |
(a) | Cash equivalents include funds held in money market instruments and are reported at their current carrying value, which approximates fair value due to the short-term nature of these instruments and are included in cash and cash equivalents in the consolidated balance sheet.
(b) | The fair value of the earnout consideration, which is based on the present value of the expected future payments to be made to the sellers of the acquired businesses, was derived by analyzing the future performance of the acquired businesses using the earnout formula and performance targets specified in each purchase agreement and adjusting those amounts to reflect the ability of the acquired entities to achieve the stated targets. Given the significance of the unobservable inputs, the valuations are classified in Level 3 of the fair value hierarchy. The change in earnout consideration reflects a $2,675 payment, partially offset by $115 of accretion.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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