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LEASES - Lease Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2018
Lease Costs          
Operating lease expense $ 23,342 $ 21,220 $ 68,069 $ 64,241  
Short-term lease expense 1,743 2,871 5,340 5,934  
Total lease expense $ 25,085 $ 24,091 73,409 70,175  
Other Lease Information          
Operating cash flows from operating leases     67,939 70,997  
Right-of-use lease assets obtained in exchange for new lease liabilities     $ 122,869 $ 38,028  
Lease Term and Discount Rate          
Weighted average remaining lease term (in years) 6 years 6 months   6 years 6 months    
Weighted average discount rate (percent) 3.20%   3.20%    
Lessee, Lease, Description [Line Items]          
Weighted average remaining lease term, excluding Chicago office space (in years) 5 years 3 months 18 days   5 years 3 months 18 days    
Chicago Office Space          
Lessee, Lease, Description [Line Items]          
Lease term (in years)         15 years