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Contract Assets (Tables) | 6 Months Ended
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Jun. 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:
| Six Months Ended
| June 30,
(in thousands) |  | 2019 |  |  | 2018
Beginning balance as of December 31, | $ | 140,082 |  | $ | 146,496
Revenue recognized |  | 1,109,396 |  |  | 1,179,105
Amounts collected or invoiced | (1,093,932) |  | (1,177,370)
Ending balance as of June 30, | $ | 155,546 |  | $ | 148,231

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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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