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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
Finance lease right-of-use assets, net $ 77,837 $ 46,746
Finance lease liabilities    
Current 22,421 14,385
Noncurrent 34,805 24,091
Total finance lease liabilities $ 57,226 $ 38,476
Weighted average remaining lease term - finance leases (in months) 3 years 4 months 9 days 3 years 6 months 25 days
Weighted average discount rate - finance leases (as a percent) 5.89% 5.77%
Accumulated amortization $ 15,600 $ 9,800
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, plant and equipment, net Property, plant and equipment, net