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Leases - Lease Costs and Other Quantitative Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Operating lease cost $ 16,898 $ 18,511 $ 34,025 $ 34,902
Variable lease cost 2,328 3,573 4,921 8,228
Sublease rental income (2,311) (2,892) (4,875) (5,697)
Total lease cost 16,915 19,192 34,071 37,433
Operating cash flows 17,463 17,592 34,259 35,227
Right-of-use assets obtained in exchange for new operating lease liabilities $ 620 $ 30,815 $ 4,436 $ 37,934
Weighted average remaining lease term (in years) - Operating leases 7 years 1 month 6 days 7 years 4 months 24 days 7 years 1 month 6 days 7 years 4 months 24 days
Weighted average discount rate - Operating leases 10.70% 10.50% 10.70% 10.50%