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REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jan. 01, 2018
REVENUE.    
Contract asset (current) $ 14,136 $ 13,984
Increase / (decrease) in contract asset (current) 152  
Contract liability (current) 393 15
Increase / (decrease) in contract liability (current) 378  
Contract liability (long-term) 519 824
Increase / (decrease) in contract liability (long-term) (305)  
Revenue recognized previously included in current contract liabilities 89  
Unearned revenue associated with outstanding contracts 912 $ 839
Estimated revenue to be recognized in 2018 167  
Estimated revenue to be recognized in 2019 369  
Estimated revenue to be recognized after 2019 $ 376