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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Deferred revenue	$ 52,364		$ 57,051
Accrued loss provision	1,217		1,483
Contract liabilities	53,581		$ 58,534
Changes in contract liabilities	(5,035)	$ 17,551
Net Period Change [Member]
Changes in deferred revenue	(4,687)
Changes in accrued loss provision	(266)
Changes in contract liabilities	$ (4,953)

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- Definition

Its represent the contract with customer, liability excluding provision for loss on contracts, current.

+ References

No definition available.

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- Definition

The increase (decrease) during the reporting period of the amount of accrued loss provision.

+ References

No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
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- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Topic 230
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-Section 45
-Paragraph 28
-Subparagraph (a)
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- Definition

The increase (decrease) during the reporting period, excluding the portion taken into income, in the liability reflecting revenue yet to be earned for which cash or other forms of consideration was received or recorded as a receivable.

+ References

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- Definition

Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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