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Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Summary of Activity of Deferred Revenue and Customer Advances

The following is a summary of the activity of the Company’s deferred revenue and customer advances for the year ended December 31, 2018, 2017 and 2016 (in thousands):

		December 31,
		2018				2017				2016
Balance at the beginning of the period		$	192,589			$	173,780			$	170,201
Recognition of revenue included in balance at beginning of the period			(159,258	)			(143,589	)			(140,688	)
Revenue deferred during the period, net of revenue recognized			170,926				162,398				144,267
Balance at the end of the period		$	204,257			$	192,589			$	173,780

Schedule of Amount of Deferred Revenue and Customer Advances

The amount of deferred revenue and customer advances equals the transaction price allocated to unfulfilled performance obligations for the period presented. Such amounts are expected to be recognized in the future as follows (in thousands):

		December 31, 2018
Deferred revenue and customer advances expected to be recognized:
In one year or less		$	164,965
In 13-24 months			22,856
In 25 months and beyond			16,436
Total		$	204,257

X

- Definition

Tabular disclosure of contract balances and changes in contract balances.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045

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- References

No definition available.

+ Details

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X

- Definition

Tabular disclosure of expected timing for satisfying remaining performance obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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