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LEASES - Components of lease expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Jan. 01, 2019
Lease cost:        
Operating Lease Cost $ 12,583   $ 25,051  
Short Term Lease Cost 2,499   4,551  
Variable Lease Cost 79   177  
Total lease cost $ 15,161   $ 29,779  
Cumulative gain from sale and leaseback transactions recognized       $ 4,700
Tax on gain of sales lease buyback transaction   $ 1,700    
Minimum [Member]        
Lessee Operating Lease Renewal Term 1 year   1 year  
Maximum [Member]        
Lessee Operating Lease Renewal Term 30 years   30 years