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PREMISES AND EQUIPMENT, NET - Summary by Country (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Total $ 74,991 $ 45,631
United States    
Property, Plant and Equipment [Line Items]    
Total 34,817 25,693
India    
Property, Plant and Equipment [Line Items]    
Total 20,405 3,154
Luxembourg    
Property, Plant and Equipment [Line Items]    
Total 15,874 14,975
Philippines    
Property, Plant and Equipment [Line Items]    
Total 3,551 1,754
Other    
Property, Plant and Equipment [Line Items]    
Total $ 344 $ 55