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LEASES - Lease Data (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2018
Lease Costs      
Operating lease expense $ 21,645 $ 21,562  
Short-term lease expense 2,460 1,601  
Total lease expense 24,105 23,163  
Other Lease Information      
Operating cash flows from operating leases 21,381 21,114  
Right-of-use lease assets obtained in exchange for new lease liabilities $ 23,646 $ 15,253  
Lease Term and Discount Rate      
Weighted average remaining lease term (in years) 6 years 2 months 12 days    
Weighted average discount rate (percent) 2.90%    
Lessee, Lease, Description [Line Items]      
Weighted average remaining lease term, excluding Chicago office space (in years) 4 years 4 months 24 days    
Chicago Office Space      
Lessee, Lease, Description [Line Items]      
Lease term (in years)     15 years