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LEASES - Lease Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease Costs        
Operating lease expense $ 21,459 $ 21,508 $ 43,021 $ 41,482
Short-term lease expense 1,462 4,027 3,063 6,599
Total lease expense $ 22,921 $ 25,535 46,084 48,081
Other Lease Information        
Operating cash flows from operating leases     42,495 38,655
Right-of-use lease assets obtained in exchange for new lease liabilities     $ 18,299 $ 70,993
Lease Term and Discount Rate        
Weighted average remaining lease term (in years) 6 years 7 months 6 days   6 years 7 months 6 days  
Weighted average discount rate (percent) 3.10%   3.10%  
Lessee, Lease, Description [Line Items]        
Weighted average remaining lease term, excluding Chicago office space (in years)     4 years 6 months  
Chicago Office Space        
Lessee, Lease, Description [Line Items]        
Lease term (in years) 15 years   15 years