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Fair value measurement
6 Months Ended
Jun. 28, 2020
Fair Value Disclosures [Abstract]  
Fair value measurement Fair value measurement
The following tables provide information regarding our financial assets and liabilities measured at fair value on a recurring basis as of June 28, 2020 and December 31, 2019:
 
Total carrying value at
 June 28, 2020
Quoted prices in active
markets (Level 1)
Significant other
observable
Inputs (Level 2)
Significant
unobservable
Inputs (Level 3)
 (Dollars in thousands)
Investments in marketable securities$10,557  $10,557  $—  $—  
Derivative assets58,453  —  58,453  —  
Derivative liabilities3,578  —  3,578  —  
Contingent consideration liabilities49,279  —  —  49,279  

 Total carrying
value at December 31, 2019
Quoted prices in active
markets (Level 1)
Significant other
observable
Inputs (Level 2)
Significant
unobservable
Inputs (Level 3)
 (Dollars in thousands)
Investments in marketable securities$10,926  $10,926  $—  $—  
Derivative assets36,492  —  36,492  —  
Derivative liabilities1,387  —  1,387  —  
Contingent consideration liabilities219,908  —  —  219,908  
Valuation Techniques
Our financial assets valued based upon Level 1 inputs are comprised of investments in marketable securities held in trust, which are available to satisfy benefit obligations under our benefit plans and other arrangements. The investment assets of the trust are valued using quoted market prices.
Our financial assets and liabilities valued based upon Level 2 inputs are comprised of foreign currency forward contracts and cross-currency interest rate swap agreements. We use foreign currency forwards and cross-currency interest rate swaps to manage foreign currency transaction exposure, as well as exposure to foreign currency denominated monetary assets and liabilities. We measure the fair value of the foreign currency forwards and cross-currency swaps by calculating the amount required to enter into offsetting contracts with similar remaining maturities, based on quoted market prices, and taking into account the creditworthiness of the counterparties.

Our financial liabilities valued based upon Level 3 inputs (inputs that are not observable in the market) are comprised of contingent consideration arrangements pertaining to our acquisitions, which are discussed immediately below.
Contingent consideration
Contingent consideration liabilities, which primarily consist of payment obligations that are contingent upon the achievement of revenue-based goals, but also can be based on other milestones such as regulatory approvals, are remeasured to fair value each reporting period using assumptions including estimated revenues (based on internal operational budgets and long-range strategic plans), discount rates, probability of payment and projected payment dates.
We determine the fair value of the contingent consideration liabilities related to the NeoTract and Essential Medical acquisitions, which represent most of our contingent consideration liabilities as of June 28, 2020 and December 31, 2019, using a Monte Carlo simulation (which involves a simulation of future revenues during the earn-out period using management's best estimates). Increases in projected revenues, estimated cash flows and probabilities of payment may result in significantly higher fair value measurements; decreases in these items may have the opposite effect. Increases in the discount rates in periods prior to payment may result in significantly lower fair value measurements and decreases in the discount rates may have the opposite effect.
The table below provides additional information regarding the valuation technique and inputs used in determining the fair value of contingent consideration.
Contingent Consideration LiabilityValuation TechniqueUnobservable InputRange (Weighted average)
Milestone-based payments
Discounted cash flowDiscount rate
3.3% - 4.3% (3.7%)
Projected year of payment2021 - 2023
Revenue-based payments
Monte Carlo simulationRevenue volatility
19.5% - 24.2% (21.9%)
  Risk free rateCost of debt structure
Projected year of payment2020 - 2022
Discounted cash flowDiscount rate
10.0%
Projected year of payment2020 - 2029
The following table provides information regarding changes in the contingent consideration liabilities during the six months ended June 28, 2020:
 Contingent consideration
 (Dollars in thousands)
Balance - December 31, 2019
$219,908  
Payments (1)
(140,718) 
Revaluations (2)
(29,951) 
Translation adjustment
40  
Balance - June 28, 2020
$49,279  
(1) Consists mainly of a $140.6 million payment associated with our acquisition of NeoTract, Inc. resulting from the achievement of a revenue-based goal for the period from January 1, 2019 to December 31, 2019.
(2) The decrease, which is included within selling, general and administrative expenses, is mainly due to adverse financial projections resulting from the COVID-19 pandemic.