REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Dec. 31, 2018
REVENUE.
Contract asset (current)	$ 19,044	$ 15,858
Increase / (decrease) in contract asset (current)	3,186
Contract liability (current)	59,500	68,134
Increase / (decrease) in contract liability (current)	(8,634)
Contract liability (long-term)	12,705	11,261
Increase / (decrease) in contract liability (long-term)	1,444
Revenue recognized previously included in current contract liabilities	40,900
Revenue recognized previously included in current contract liabilities at beginning of year	22,600
Unearned revenue associated with outstanding contracts	504	$ 758
Estimated revenue to be recognized in 2019	49
Estimated revenue to be recognized in 2020	260
Estimated revenue to be recognized after 2020	$ 195

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

No definition available.

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- Definition

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

+ References

No definition available.

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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

No definition available.

+ Details

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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.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition

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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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.

+ References

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-Publisher FASB
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- Definition

Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

+ References

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- References

No definition available.

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- Definition

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

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