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LEASES - Description (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
lease
Dec. 31, 2019
USD ($)
LEASES      
Number of facility leases | lease   388  
Number of subleases | lease   14  
Number of finance leases | lease   2  
Number of lessor owned properties | lease   2  
Reduction in right- of-use assets $ 5,700 $ 5,700  
Reduction in Lease liability $ 5,700 5,700  
Operating lease liabilities   60,984 $ 72,143
Variable Lease, Cost   1,100 1,600
Property tax expense   $ 800 $ 800
Minimum      
LEASES      
Lessee operating lease renewal term   1 year  
Maximum      
LEASES      
Lessee operating lease renewal term   5 years