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Revenue Recognition (Tables) | 12 Months Ended
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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 |

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- 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 + Details
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- 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 + Details
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