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Leases - Additional information regarding leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Operating lease costs $ 31,826 $ 30,478 $ 27,600
Cash payments included in the measurement of lease liabilities reported in operating cash flows 30,365 27,521  
Right-of-use assets obtained in exchange for new lease liabilities 12,060 $ 7,445  
Operating lease liability $ 136,015    
Weighted average discount rate 3.90% 3.90%  
Weighted average remaining lease term 5 years 9 months 18 days 6 years 4 months 24 days  
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities    
Other assets      
Lessee, Lease, Description [Line Items]      
Right-of-use assets $ 115,911 $ 131,661  
Other liabilities      
Lessee, Lease, Description [Line Items]      
Operating lease liability $ 136,015 $ 150,519  
Maximum      
Lessee, Lease, Description [Line Items]      
Operating lease term 10 years