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REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Jan. 01, 2018
REVENUE. |  |
Contract asset (current) | $ 13,485 | $ 13,984
Increase / (decrease) in contract asset (current) | (499) |
Contract liability (current) | 114 | 15
Increase / (decrease) in contract liability (current) | 99 |
Contract liability (long-term) | 811 | 824
Increase / (decrease) in contract liability (long-term) | (13) |
Revenue recognized previously included in current contract liabilities | 51 |
Unearned revenue associated with outstanding contracts | 925 | $ 839
Estimated revenue to be recognized in 2018 | 89 |
Estimated revenue to be recognized in 2019 | 161 |
Estimated revenue to be recognized after 2019 | $ 675 |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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