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Restructuring and Impairment Charges (Narrative) (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 08, 2020 USD ($) | Sep. 10, 2020 USD ($) | Sep. 30, 2020 USD ($) | Oct. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) item $ / ft² | Dec. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Impairment and loss on right of use asset |  |  | $ 17,540 |  | $ 17,540 |
Non-cash impairment charges |  |  | $ 8,978 |  |  |
Gain related to lease termination |  |  |  | $ 2,445 | $ 15,200 | $ 2,445
Lessee, Operating Lease, Discount Rate |  |  |  |  | 11.30% |
Gain (Loss) on Termination of Lease |  |  |  | $ 2,445 | $ 15,200 | 2,445
Goodwill impairment |  |  |  |  |  | 21,521
Number of renewal options | item |  |  |  |  | 2 |
Extension term |  |  |  |  | 5 years |
Impairment charge |  |  |  |  | $ 18,951 |
Restructuring and impairment charges |  |  |  |  | 18,325 | 22,371
Employee Severance [Member] | Shoals Facility [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  | 6,578 |
Facility Closing [Member] | Shoals Facility [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment charges |  | $ 26,576 |  |  |  |
Gain related to lease termination | $ 15,234 |  |  |  |  |
Fair value of property, plant and equipment |  |  |  |  | $ 10,383 |
Lessee, Operating Sublease, Pricing | $ / ft² |  |  |  |  | 3.5 |
Lessee, Operating Sublease, Remaining Term |  |  |  |  | 75 months |
Lessee, Operating Lease, Discount Rate |  |  |  |  | 6.50% |
Gain (Loss) on Termination of Lease | $ 15,234 |  |  |  |  |
Extension term |  |  |  |  | 1 month |
Right Of Use Asset [Member] | Facility Closing [Member] | Shoals Facility [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Non-cash impairment charges |  | 17,540 |  |  |  |
Property, Plant And Equipment At Facility[Member] | Facility Closing [Member] | Shoals Facility [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Non-cash impairment charges |  | $ 9,036 |  |  |  |
Manufacturing [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  | $ 21,521
Restructuring and impairment charges |  |  |  |  | $ 17,775 |
Corporate and Other [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  | $ 550 |

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