Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Weighted Average Discount Rate
Weighted-average discount rate - finance leases	5.11%	5.37%
Weighted-average discount rate - operating leases	5.19%	5.18%
Operating Leases
Other assets, non-current	$ 32,754	$ 40,511
Finance Leases
Property and equipment, gross	113,732	104,433
Accumulated depreciation	(58,153)	(60,272)
Property and equipment, net	55,579	44,161
Total finance lease liabilities	$ 54,388	$ 47,911
Weighted Average Remaining Lease Term
Weighted-average remaining lease term - finance leases	1 year 7 months 28 days	1 year 4 months 9 days
Weighted-average remaining lease term - operating leases	3 years 4 months 24 days	4 years
Capital Lease Obligations
Finance Leases
Debt, non-current	$ 23,004	$ 25,837
Other Current Liabilities
Operating Leases
Accrued liabilities and other	11,202	12,410
Other Noncurrent Liabilities
Operating Leases
Other long-term liabilities	20,631	27,433
Other Liabilities
Operating Leases
Total operating lease liabilities	31,833	39,843
Capital Lease Obligations
Finance Leases
Debt, current	$ 31,384	$ 22,074