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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Changes in Fair Value of Company's Earn-Out Liability
The following table presents a summary of changes in fair value of the Company's Level 3 earn-out liabilities measured on a recurring basis for the three months ended March 31, 2021:
(in thousands)MUSA-StainlessMUSA-GalvanizedAmerican StainlessTotal
Balance December 31, 2020$375 $941 $2,405 $3,721 
Earn-out payments during the period
(385)(171)(473)(1,029)
Changes in fair value during the period
10 45 170 225 
Balance March 31, 2021$— $815 $2,102 $2,917 
Schedule of Level 3 Assets and the Valuation Techniques Used to Measure Fair Value
The following table summarizes the significant unobservable inputs in the fair value measurement of our contingent consideration (earn-out) liabilities as of March 31, 2021:
InstrumentFair Value
March 31, 2021
Principal Valuation TechniqueSignificant Unobservable InputsRangeWeighted
Average
Contingent consideration (earn-out) liabilities$2,917Probability Weighted Expected ReturnDiscount rate-5%
Timing of estimated payouts2021 - 2022-
Future revenue projections
$4.7M - 7.9M
$6.7M