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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

X

- Definition

The amount of increase (decrease) in current contract liabilities during the period.

+ References

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- Definition

The increase (decrease) in non-current contract liabilities.

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized, estimated to be recognized after the second year.

+ References

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized, estimated to be recognized in the following year.

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Amount of transaction price allocated to performance obligation that has not been recognized, estimated to be recognized in the remainder of the current year.

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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

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Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

+ References

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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