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LEASES - Lease Data (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Lease Costs  
Operating lease expense $ 16,822
Short-term lease expense 2,341
Total lease expense 19,163
Other Lease Information  
Operating cash flows from operating leases 16,629
Right-of-use lease assets obtained in exchange for new lease liabilities $ 7,732
Lease Term and Discount Rate  
Weighted average remaining lease term (in years) 7 years 10 months 8 days
Weighted average discount rate (percent) 3.60%