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Financial Instruments
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Financial Instruments Financial Instruments
The table below presents the carrying amounts and estimated fair values of our financial instruments by hierarchy level as of September 30, 2021 and December 31, 2020:
September 30, 2021
Hierarchy Level
(Fair Value)
Carrying
Amount
Level 1Level 2Level 3
Liabilities
Acquisition-related contingent consideration, including
current portion (1)(2)
$14,568 $— $— $14,568 
2023 Convertible Notes (3)
294,355 — 444,957 — 
Total$308,923 $— $444,957 $14,568 
December 31, 2020
Hierarchy Level
(Fair Value)
Carrying
Amount
Level 1Level 2Level 3
Liabilities   
Acquisition-related contingent consideration, including
current portion (1)(2)
$20,118 $— $— $20,118 
2023 Convertible Notes (3)
286,131 — 396,982 — 
Total$306,249 $— $396,982 $20,118 
(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.
(2)During the nine months ended September 30, 2021, we acquired certain assets of a business and recorded an acquisition-related contingent consideration liability.
(3)The carrying values include unamortized deferred debt issue costs and debt discount.
The fair values of financial instruments not included in the tables above are estimated to be equal to their carrying values as of September 30, 2021 and December 31, 2020.
We estimate the fair value of our 2023 Convertible Notes based on their last actively traded prices. The fair value of our 2023 Convertible Notes 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 either a probability-weighted discounted cash flow model or a Monte Carlo simulation. These fair value estimates represent Level 3 measurements as they are based on significant inputs not observed in the market and reflect our own assumptions. Significant increases (or decreases) in these unobservable inputs in isolation would result in significantly lower (or higher) fair values. We reassess the fair value of our acquisition-related contingent consideration at each reporting period based on additional information as it becomes available.
The table below presents the change in our liability for acquisition-related contingent consideration for our Level 3 financial instruments:
Contingent Consideration
Balance at December 31, 2020$20,118 
Accretion expense (1)
1,289 
Payments(1,000)
Foreign currency translation adjustment (2)
(612)
Balance at March 31, 2021$19,795 
Additions1,093 
Accretion expense (1)
676 
Payments(4,122)
Foreign currency translation adjustment (2)
264 
Remeasurement gain (3)
(3,095)
Balance at June 30, 2021$14,611 
Accretion expense (1)
116 
Foreign currency translation adjustment (2)
(159)
Balance at September 30, 2021$14,568 
Contingent Consideration
Balance at December 31, 2019$14,826 
Accretion expense (1)
506 
Foreign currency translation adjustment (2)
(148)
Balance at March 31, 2020$15,184 
Accretion expense (1)
614 
Payments(4,692)
Foreign currency translation adjustment (2)
88 
Balance at June 30, 2020$11,194 
Additions3,460 
Accretion expense (1)
3,532 
Foreign currency translation adjustment (2)
359 
Balance at September 30, 2020$18,545 
(1)Accretion expense is included in SG&A expenses on the Condensed Consolidated Statements of Comprehensive Income.
(2)Foreign currency translation adjustments are included in "Other comprehensive income (loss), net of tax" on the Condensed Consolidated Statements of Comprehensive Income.
(3)Remeasurement gain or loss resulting from a change in the fair value of an acquisition's contingent consideration liability is recorded in SG&A expenses on the Condensed Consolidated Statements of Comprehensive Income.