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Leases - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Lessee, Lease, Description [Line Items]
Restricted funds	$ 29,259	$ 21,644	$ 31,447
Lease Agreements
Lessee, Lease, Description [Line Items]
Letters of credit outstanding, amount	3,400	3,500
Restricted funds	$ 3,400	$ 3,500

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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