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
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