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LEASES - Lease Data (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Lease Costs      
Operating lease expense $ 19,974 $ 16,822  
Short-term lease expense 2,572 2,341  
Total lease expense 22,546 19,163  
Other Lease Information      
Operating cash flows from operating leases 19,112 16,629  
Right-of-use lease assets obtained in exchange for new lease liabilities $ 60,281 $ 7,732  
Lease Term and Discount Rate      
Weighted average remaining lease term (in years) 7 years 2 months 12 days    
Weighted average discount rate (percent) 3.30%    
Lessee, Lease, Description [Line Items]      
Weighted average remaining lease term, excluding Chicago office space (in years) 4 years 10 months 24 days    
Chicago Office Space      
Lessee, Lease, Description [Line Items]      
Lease term (in years)     15 years