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Leases - Lease Costs and Other Quantitative Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease cost $ 71,257 $ 67,044 $ 65,093
Variable lease cost 14,640 18,879  
Sublease rental income (11,329) (8,965) $ (3,671)
Total lease cost 74,568 76,958  
Operating cash flows 70,277 69,735  
Right-of-use assets obtained in exchange for new operating lease liabilities $ 45,663 $ 269,801  
Weighted average remaining lease term (in years) - Operating leases 7 years 2 months 12 days 5 years 3 months 18 days  
Weighted average discount rate - Operating leases 10.60% 8.60%