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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Impact of Adopting ASC 606 on Audited Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Accounts receivable $ 60,666   $ 16,911
Deferred contract costs, prepaid expenses and other current assets 21,853   37,772
Customer advances 561   21,828
Deferred Revenue 3,947   7,286
Accumulated earnings (1,212,790)   $ (1,226,173)
Balance Without Adoption of ASC 606      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Accounts receivable 31,060    
Deferred contract costs, prepaid expenses and other current assets 73,120    
Customer advances 26,582    
Deferred Revenue 3,826    
Accumulated earnings (1,217,029)    
ASU 2014-09      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Deferred contract costs, prepaid expenses and other current assets   $ 27,926  
Customer advances   6,605  
Deferred Revenue   4,743  
Accumulated earnings   (1,217,610)  
ASU 2014-09 | Effect of Change Higher/(Lower)      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Accounts receivable (29,606)    
Deferred contract costs, prepaid expenses and other current assets 51,267 (9,846)  
Customer advances (26,021) (15,223)  
Deferred Revenue 121 (2,543)  
Accumulated earnings $ 4,239 $ 8,563