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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Unbilled Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
1 Year or less [1] $ 172,656 $ 160,084
1-2 Years 95,013  
2-5 Years 56,224  
Total $ 323,893  
Percentage of unbilled receivables, 1 Year or Less 54.00%  
Percentage of unbilled receivables, 1-2 Years 29.00%  
Percentage of unbilled receivables, 2-5 Years 17.00%  
Total percentage of unbilled receivables 100.00%  
[1] On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.