REVENUE RECOGNITION - Summary of Significant Changes in Unbilled Receivables and Deferred Liabilities Balances (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)
Deferred Revenue (Increase) Decrease
Balance at December 31, 2017	$ (38,883)
Adoption of revenue standard on January 1, 2018	(21,307)
Adjusted balance on January 1, 2018	(60,190)
Revenue recognized that was previously included in deferred revenue	64,562
Increases due to cash received	(130,639)
Cumulative catch-up adjustment arising from changes in estimates of transaction price	3,700
Net change	(62,377)
Balance at December 31, 2018	(122,567)
Unbilled Receivables Increase (Decrease)
Balance at December 31, 2017	70
Adoption of revenue standard on January 1, 2018	307
Adjusted balance on January 1, 2018	377
Unbilled receivables recognized	2,024
Transferred to receivables from unbilled receivables	(1,381)
Net change	643
Balance at December 31, 2018	$ 1,020

Adjusted balance deferred revenue.

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- Definition

Adjusted balance unbilled receivables.

+ References

No definition available.

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- Definition

Cumulative effect of new accounting principle in period of adoption for deferred revenue.

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No definition available.

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- Definition

Cumulative effect of new accounting principle in period of adoption for unbilled receivables.

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No definition available.

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- Definition

Increase (decrease) in unbilled receivables.

+ References

No definition available.

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- Definition

Increases due to cash received.

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No definition available.

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- Definition

Net increase (decrease) in deferred revenue.

+ References

No definition available.

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Transferred to receivables from unbilled receivables.

+ References

No definition available.

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Unbilled receivables increase (decrease), net.

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No definition available.

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Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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- Definition

Amount of increase (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.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
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- Definition

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=68054760&loc=d3e55302-109406

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