REVENUE RECOGNITION - Summary of Significant Changes in Unbilled Receivables and Deferred Liabilities Balances (Details) $ in Thousands	6 Months Ended
Jun. 30, 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	22,669
Increases due to cash received	(64,423)
Cumulative catch-up adjustment arising from changes in estimates of transaction price	4,353
Net change	(37,401)
Balance at June 30, 2018	(97,591)
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	2,241
Net change	2,241
Balance at June 30, 2018	$ 2,618

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.

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No definition available.

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- Definition

Increases due to cash received.

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No definition available.

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Net increase (decrease) in deferred revenue.

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No definition available.

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- Definition

Unbilled receivables increase (decrease), net.

+ References

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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-Topic 606
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- Definition

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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No definition available.

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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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- Definition

The increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts.

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Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
-Section 45
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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