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Credit Losses (Tables) | 12 Months Ended
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Dec. 31, 2021
Credit Loss [Abstract] |
Accounts receivable, allowance for credit loss | The following table summarizes the changes in allowance for credit losses on our accounts receivables, certain non-trade accounts receivable and contract assets for the year ended December 31, 2021 and 2020 (in thousands):
| For the Year Ended December 31,
| 2021 |  | 2020
Balance as of beginning of period | $ | (7,056) |  |  | $ | (41) |
Passport acquisition | — |  |  | (2,582) |
Cumulative transition adjustment | — |  |  | (2,815) |
Provision for credit losses | (2,411) |  |  | (3,283) |
Charge-offs(1) | 6,093 |  |  | 1,665 |
Balance as of end of period | $ | (3,374) |  |  | $ | (7,056) |
(1)Charge offs for the year ended December 31, 2021, are primarily due to balances written-off that were previously fully reserved as part of the Passport transaction.

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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