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Fair Value Measurements (Tables)
12 Months Ended
Dec. 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 2021 and 2020:
(in thousands)MUSA-StainlessMUSA-GalvanizedAmerican StainlessTotal
Balance December 31, 2019$2,403 $1,782 $4,969 $9,154 
Earn-out payments during period
(1,625)(611)(2,002)$(4,238)
Changes in fair value during the period
(403)(230)(562)$(1,195)
Balance December 31, 2020$375 $941 $2,405 $3,721 
Earn-out payments during period
(385)(780)(2,467)$(3,632)
Changes in fair value during the period
10 945 917 $1,872 
Balance December 31, 2021$— $1,106 $855 $1,961 
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 December 31, 2021:
InstrumentFair Value
December 31, 2021
Principal Valuation TechniqueSignificant Unobservable InputsRangeWeighted
Average
Contingent consideration (earn-out) liabilities$1,961Probability Weighted Expected ReturnDiscount rate-5%
Timing of estimated payouts2022-
Future revenue projections
$9.1M
$9.1M
Schedule of Assets Held for Sale
The assets classified as held for sale as of December 31, 2021 are as follows:

(in thousands)2021
Inventory, net$617 
Property, plant and equipment, net238 
Assets held for sale$855