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SOFTWARE DEVELOPMENT COSTS AND LICENSES (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]            
Software development costs and licenses, Current   $ 39,369   $ 39,369   $ 41,721
Software development costs and licenses, Non-current   586,866   586,866   381,910
Software development impairment charges   0 $ 7,731 960 $ 19,325  
Software development costs and royalties $ 84,176          
Research and development 23,251          
Capitalized costs, net $ 5,361          
Software development costs, internally developed            
Finite-Lived Intangible Assets [Line Items]            
Software development costs and licenses, Current   30,420   30,420   28,959
Software development costs and licenses, Non-current   477,883   477,883   310,229
Software development costs, externally developed            
Finite-Lived Intangible Assets [Line Items]            
Software development costs and licenses, Current   6,611   6,611   5,455
Software development costs and licenses, Non-current   108,858   108,858   71,407
Licenses            
Finite-Lived Intangible Assets [Line Items]            
Software development costs and licenses, Current   2,338   2,338   7,307
Software development costs and licenses, Non-current   125   125   $ 274
Restricted stock units            
Finite-Lived Intangible Assets [Line Items]            
Shares reclassified (in shares) 5,550,000          
Additional Paid-in Capital | Restricted stock units            
Finite-Lived Intangible Assets [Line Items]            
Shares reclassified   $ 74,707   $ 74,707    
Other long-term liabilities | Restricted stock units            
Finite-Lived Intangible Assets [Line Items]            
Shares reclassified $ (74,707)          
Incremental cost $ 112,789