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Contract Assets (Tables) | 9 Months Ended
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Sep. 30, 2018
Contract With Customer Asset And Liability [Abstract] |
Changes In Contract Assets | Significant changes in the contract asset balance during the pe riod are as follows:
| Nine Months Ended
| September 30,
(in thousands) |  | 2018 |  |  | 2017
Beginning balance as of December 31, 2017 | $ | 146,496 |  | $ | 156,206
Revenue recognized |  | 1,774,620 |  |  | 1,667,090
Amounts collected or invoiced |  | (1,765,218) |  |  | (1,661,717)
Ending balance as of September 30, 2018 | $ | 155,898 |  | $ | 161,579

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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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