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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
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 2020 and 2019:
(in thousands) | MUSA-Stainless |  | MUSA-Galvanized |  | American Stainless |  | Total
Balance December 31, 2018 | $ | 4,252 |  |  | $ | 3,358 |  |  | $ | — |  |  | $ | 7,610 |
Fair value of the earn-out liability associated with the American Stainless (ASTI) acquisition | — |  |  | — |  |  | 6,366 |  |  | $ | 6,366 |
Earn-out payments during period | (1,634) |  |  | (712) |  |  | (1,729) |  |  | $ | (4,075) |
Changes in fair value during the period | (215) |  |  | (864) |  |  | 332 |  |  | $ | (747) |
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 |
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, 2020:
Instrument | Fair Value December 31, 2020 | Principal Valuation Technique | Significant Unobservable Inputs | Range | Weighted Average
Contingent consideration (earn-out) liabilities | $3,721 | Probability Weighted Expected Return | Discount rate | - | 5%
Timing of estimated payouts | 2021 - 2022 | -
Future revenue projections | $4.7M - 12.7M | $9.7M

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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