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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Asset and Liability | The following table presents the ending and beginning balances of costs in excess of billings, billings in excess of cost and unearned revenue, respectively, as of December 31, (in thousands):
| 2021 |  | 2020 |  | 2019
Costs in excess of billings | $ | 54,437 |  |  | $ | 26,915 |  |  | $ | 20,607 |
Billings in excess of cost | (46,711) |  |  | (34,702) |  |  | (47,598) |
Unearned revenue | (3,681) |  |  | (21,325) |  |  | (15,389) |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + 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=123351226&loc=SL49130551-203045 + Details
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