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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 938,154 $ 909,212
Accumulated depreciation (571,408) (563,483)
Total property and equipment 366,746 345,729
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 250 250
Medical equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 425,892 449,776
Computer and office equipment, furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 120,490 102,798
Software development costs    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 0 6,391
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 377,417 337,878
Equipment under financing/capital lease    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 14,105 $ 12,119