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LEASES - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 25,804 $ 51,467
Amortization of finance lease liabilities 21 48
Interest on finance leases 3 6
Short-term and variable lease cost 11,892 26,110
Net lease cost $ 37,720 $ 77,631