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Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Allowance for doubtful accounts receivable | $ 39,641 | $ 33,901 | $ 40,474 |  | $ 29,381
Cumulative Effect on Retained Earnings, before Tax | 0 | 2,706 |  |  |
Provision for Other Credit Losses | 112 | 3,703 |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | (973) | (811) |  |  |
Accounts Receivable, Other, Including Dispositions and Foreign Currency | $ 28 | (1,078) |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  | $ (2,112) |  | $ 2,100 |
Retained Earnings Effect, Tax |  |  | $ 600 |  |

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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