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REVENUE Revenue from Contract with Customer (Tables)
 9 Months Ended
Sep. 30, 2018
Capitalized Contract Cost [Line Items]  
Contract with Customer, Asset and Liability [Table Text Block]
Contract asset activity for the nine months ended September 30, 2018 was as follows (in thousands):
 
September 30, 2018
Contract asset at January 1, 2018
$
6,579

Revenue in excess of billings
20,099

Customer billings
(8,133
)
Contract asset at September 30, 2018
$
18,545

Less: long-term portion (recorded in other long-term assets)
1,398

Contract asset, current portion
$
17,147



The increase in contract assets during the nine months ended September 30, 2018 is due to (i) continued growth in our subscription offerings and (ii) the timing of payments due under our enterprise network agreements which predominately are payable annually whereas performance obligations are fulfilled on a continuous basis.