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LEASES - Description (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
lease
Dec. 31, 2018
USD ($)
facility
Lessee, Lease, Description [Line Items]    
Number of operating leases | lease 580  
Number of subleases | lease 14  
Number of finance leases | lease 65  
Number of lessor owned properties | lease 3  
Lessee Operating Lease Existence Of Option To Extend true  
Renewal option for lease facility (Number) | lease 1  
Exit-disposal cease use liability | $   $ 18,800
Number of abandoned facility leases | facility   17
Impairment of lease | $ $ 17,900  
Finance lease, accumulated amortization | $ 1,700  
Operating lease liabilities | $ $ 75,169  
Long-term operating lease liabilities | $   $ 16,752
Minimum    
Lessee, Lease, Description [Line Items]    
Lessee operating lease renewal term 1 year  
Maximum    
Lessee, Lease, Description [Line Items]    
Lessee operating lease renewal term 5 years