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REVENUES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]      
Unearned revenue $ 146,947 $ 100,600 $ 101,029
Noncurrent contract liabilities 8,600 $ 6,000  
Deferred revenue recognized 97,300    
Capitalized Contract Cost [Line Items]      
Amortization of capitalized contract costs 51,500    
Obtain Contract      
Capitalized Contract Cost [Line Items]      
Capitalized contract costs 194,600    
Fulfill Contract      
Capitalized Contract Cost [Line Items]      
Capitalized contract costs $ 13,000