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LEASES - Lease Data (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lease Costs      
Operating lease expense $ 86,451 $ 68,489  
Short-term lease expense 15,130 11,440  
Total lease expense 101,581 79,929  
Other Lease Information      
Operating cash flows from operating leases 74,177 66,489  
Right-of-use lease assets obtained in exchange for new lease liabilities $ 95,005 $ 101,966  
Lease Term and Discount Rate      
Weighted average remaining lease term (in years) 6 years 9 months 18 days 7 years 9 months 18 days  
Weighted average discount rate (percent) 3.20% 3.40%  
Weighted average remaining lease term, excluding Chicago office space (in years) 4 years 8 months 12 days    
Chicago office space      
Lease Term and Discount Rate      
Lease term (in years)     15 years