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Leases - Supplemental lease terms (Details)
Sep. 30, 2021
Dec. 31, 2020
Leases    
Weighted-average remaining lease terms - operating leases (years) 11 years 25 days 11 years 5 months 26 days
Weighted-average discount rate - operating leases 8.92% 8.86%
Weighted-average remaining lease terms - finance lease (years) 11 years 3 months 12 years
Weighted-average discount rate - finance lease 7.80% 7.80%