REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
REVENUE.
Contract asset (current)	$ 18,561	$ 15,858
Increase / (decrease) in contract asset (current)	2,703
Contract liability (current)	64,468	68,134
Increase / (decrease) in contract liability (current)	(3,666)
Contract liability (long-term)	13,927	11,261
Increase / (decrease) in contract liability (long-term)	2,666
Revenue recognized previously included in current contract liabilities	27,900
Revenue recognized previously included in current contract liabilities at beginning of year	17,500
Unearned revenue associated with outstanding contracts	590	$ 758
Estimated revenue to be recognized in 2019	136
Estimated revenue to be recognized in 2020	270
Estimated revenue to be recognized after 2020	$ 184

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
-Section 45
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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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-Publisher FASB
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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

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