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LEASES - Lease Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2018
Lease Costs          
Operating lease expense $ 23,082 $ 21,459 $ 44,727 $ 43,021  
Short-term lease expense 1,137 1,462 3,597 3,063  
Total lease expense $ 24,219 $ 22,921 48,324 46,084  
Other Lease Information          
Operating cash flows from operating leases     43,937 42,495  
Right-of-use lease assets obtained in exchange for new lease liabilities     $ 87,554 $ 18,299  
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) 3.00%   3.00%    
Lessee, Lease, Description [Line Items]          
Weighted average remaining lease term, excluding Chicago office space (in years)     5 years 1 month 6 days    
Chicago Office Space          
Lessee, Lease, Description [Line Items]          
Lease term (in years)         15 years