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Divestitures and Assets Held for Sale - Assets and Liabilities of the Discontinued Operations Reflected in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Discontinued Operations and Disposal Groups [Abstract] |  |
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current | $ 151 | $ 1,339
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent | 151 | 151
Disposal Group, Including Discontinued Operation, Assets | 302 | 1,490
Disposal Group, Including Discontinued Operation, Accrued Expenses | (370) | 7,521
Disposal Group, Including Discontinued Operation, Accrued Severance | 300 | 2,100
Disposal Group, Including Discontinued Operation, Other Accrued Expense | 100 | 200
Disposal Group, Including Discontinued Operation, Other Receivable | $ 200 | 400
Disposal Group, Including Discontinued Operation, Deferred Assets |  | 900
Disposal Group, Including Discontinued Operation, Deferred Obligation |  | $ 5,300

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