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Contract Assets (Tables) | 9 Months Ended
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Sep. 30, 2019
Contract With Customer Asset And Liability [Abstract] |
Changes In Contract Assets | Significant changes in the contract asset balance during the period are as follows:
| Nine Months Ended
| September 30,
(in thousands) |  | 2019 |  |  | 2018
Beginning balance as of December 31, | $ | 140,082 |  | $ | 146,496
Revenue recognized |  | 1,613,047 |  |  | 1,774,620
Amounts collected or invoiced | (1,592,061) |  | (1,765,218)
Ending balance as of September 30, | $ | 161,068 |  | $ | 155,898

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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