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Financial Instruments
3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Financial Instruments
Financial Instruments
The following table presents the carrying amounts and estimated fair values of our financial instruments by hierarchy level as of March 31, 2019 and December 31, 2018:
 
March 31, 2019
 
 
 
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

 

 
317,783

 

Total
$
319,210

 
$

 
$
317,783

 
$
2,960

 
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

 
(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 Condensed 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 March 31, 2019 and December 31, 2018.
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 three months ended March 31, 2019 and 2018, there was no change in the estimated fair value of future expected contingent consideration payments.