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PROPERTY AND EQUIPMENT - Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment $ 1,026,809 $ 812,008
Less accumulated depreciation and amortization (503,827) (314,336)
Property and equipment, net 653,542 588,348
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment 3,518 2,742
Buildings    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 27,179 $ 29,309
Buildings | Minimum    
Property, Plant and Equipment [Line Items]    
Range of useful lives in years 25 years 25 years
Buildings | Maximum    
Property, Plant and Equipment [Line Items]    
Range of useful lives in years 30 years 30 years
Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 337,589 $ 280,774
Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Range of useful lives in years 2 years 2 years
Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Range of useful lives in years 20 years 20 years
Software    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 539,879 $ 411,975
Software | Minimum    
Property, Plant and Equipment [Line Items]    
Range of useful lives in years 2 years 2 years
Software | Maximum    
Property, Plant and Equipment [Line Items]    
Range of useful lives in years 10 years 10 years
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 73,298 $ 63,154
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Range of useful lives in years 3 years 3 years
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Range of useful lives in years 15 years 15 years
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 45,346 $ 24,054
Furniture and fixtures | Minimum    
Property, Plant and Equipment [Line Items]    
Range of useful lives in years 3 years 3 years
Furniture and fixtures | Maximum    
Property, Plant and Equipment [Line Items]    
Range of useful lives in years 7 years 7 years
Work-in-progress    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 130,560 $ 90,676