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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Property, Plant and Equipment [Line Items]        
Total cost $ 90,427   $ 90,427 $ 74,347
Less: accumulated depreciation (48,055)   (48,055) (43,313)
Total net book value 42,372   42,372 31,034
Depreciation 8,434 $ 9,842 $ 6,195  
Equipment        
Property, Plant and Equipment [Line Items]        
Useful Lives     5 years  
Total cost 8,788   $ 8,788 7,916
Furniture and fixtures        
Property, Plant and Equipment [Line Items]        
Useful Lives     5 years  
Total cost 20,942   $ 20,942 19,445
Leasehold improvements        
Property, Plant and Equipment [Line Items]        
Useful Lives     10 years  
Total cost 41,643   $ 41,643 34,370
Computers and software        
Property, Plant and Equipment [Line Items]        
Useful Lives     3 years  
Total cost 17,941   $ 17,941 11,499
Other        
Property, Plant and Equipment [Line Items]        
Total cost $ 1,113   $ 1,113 $ 1,117