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LEASES - Lease Data (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Lease Costs    
Operating lease expense $ 16,957 $ 33,779
Short-term lease expense 3,076 5,417
Total lease expense $ 20,033 39,196
Other Lease Information    
Operating cash flows from operating leases   33,376
Right-of-use lease assets obtained in exchange for new lease liabilities   $ 26,198
Lease Term and Discount Rate    
Weighted average remaining lease term (in years) 7 years 9 months 18 days 7 years 9 months 18 days
Weighted average discount rate (percent) 3.60% 3.60%