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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Weighted average remaining lease term for operating leases 6 years 3 months 18 days   6 years 3 months 18 days  
Weighted average discount rate for operating leases 4.30%   4.30%  
Components of Lease Expense [Abstract]        
Operating lease cost $ 13,038 $ 12,399 $ 39,043 $ 37,677
Variable lease cost 678 732 2,062 2,889
Short-term lease cost 118 41 258 145
Sublease income (1,075) (1,395) (3,264) (4,563)
Total lease expense 12,759 $ 11,777 38,099 36,148
Supplemental Cash Flow Information Related to Leases [Abstract]        
Operating cash outflow from operating leases     40,865 39,885
Right-of-use assets obtained in exchange for lease liabilities     62,514 $ 150,127
Maturities of Operating Lease Liabilities [Abstract]        
2020 15,631   15,631  
2021 53,303   53,303  
2022 36,529   36,529  
2023 26,418   26,418  
2024 21,389   21,389  
Thereafter 41,468   41,468  
Total 194,738   194,738  
Less: Finance charges 26,820   26,820  
Total principal liability 167,918   167,918  
Right-of-use assets recognized 31,300      
Additional lease liabilities not yet commenced $ 1,200   $ 1,200  
Minimum [Member]        
Leases [Abstract]        
Remaining lease terms     1 year  
Maximum [Member]        
Leases [Abstract]        
Remaining lease terms     24 years  
Extension period for leases     20 years  
Termination period for leases     1 year