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Financial Instruments | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Financial Instruments | Financial Instruments The following table presents the carrying amounts and estimated fair values of our other financial instruments by hierarchy level as of December 31, 2018 and 2017.
| December 31, 2018
|  |  | Hierarchy Level
| Carrying Amount |  | Level 1 |  | Level 2 |  | Level 3
Liabilities |  |  |  |  |  |  |
Acquisition-related contingent consideration, including current portion (1) | $ | 2,960 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,960 |
Long-term debt | 316,250 |  |  | — |  |  | 291,837 |  |  | — |
Total | $ | 319,210 |  |  | $ | — |  |  | $ | 291,837 |  |  | $ | 2,960 |
| December 31, 2017
|  |  | Hierarchy Level
| Carrying Amount |  | Level 1 |  | Level 2 |  | Level 3
Liabilities |  |  |  |  |  |  |
Acquisition-related contingent consideration, including current portion (1) | $ | 3,750 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,750 |
Long-term debt | 400,000 |  |  | — |  |  | 409,000 |  |  | — |
Total | $ | 403,750 |  |  | $ | — |  |  | $ | 409,000 |  |  | $ | 3,750 |
(1) | The short-term portion is included in “Accounts payable, accrued expenses and other,” and the long-term portion is included in “Other liabilities” on the Consolidated Balance Sheets.
The fair values of financial instruments not included in this table are estimated to be equal to their carrying values as of December 31, 2018 and 2017. We estimate the fair value of our 2023 Convertible Notes based on their last actively traded prices. The fair value of our debt is classified within Level 2 of the fair value hierarchy because it is traded in less active markets. We estimate the fair value of acquisition-related contingent consideration using a probability-weighted discounted cash flow model. This fair value estimate represents a Level 3 measurement as it is based on significant inputs not observed in the market and reflect our own assumptions. The significant unobservable inputs used in the fair value measurements of our acquisition-related contingent consideration are our measures of the future profitability and related cash flows and discount rates. The fair value of the contingent consideration is reassessed at each reporting period by the Company based on additional information as it becomes available. Any change in the fair value of an acquisition’s contingent consideration liability results in a remeasurement gain or loss that is recorded in “Selling, general and administrative expenses” on the Consolidated Statements of Comprehensive Income. During the year ended December 31, 2018, there was no change in the estimated fair value of future expected contingent consideration payments. During the years ended December 31, 2017 and 2016, we recorded $0.7 million and $1.4 million in expense related to increases in the fair value of future expected contingent consideration payments, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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