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v3.21.2

Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Credit Loss [Abstract] |  |  |  |  |
Balance at beginning of period |  | $ 2,866,578 | $ 2,203,753 | $ 2,064,586 | $ 1,778,717
Balance at end of period |  | 2,807,720 | 2,225,311 | 2,807,720 | 2,225,311
Allowance for Expected Credit Losses |  |  |  |  |
Balance at beginning of period |  | 35,979 | 36,054 | 37,781 | 21,003
Cumulative effect of accounting change | [1] |  |  |  | 6,539
Change for provision of expected credit losses | [2] | 2,736 | 1,046 | 934 | 9,558
Balance at end of period |  | 38,715 | 37,100 | 38,715 | 37,100
Write-offs charged against the allowance |  | $ 1,200 | $ 0 | $ 2,400 | $ 2,300
Accounting Standards Update |  |  |  | Accounting Standards Update 2016-13 [Member] |
[1] | Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”
[2] | Amounts deemed uncollectible are written-off in operating expenses. For the 2021 third quarter and 2020 third quarter, amounts written off were $1.2 million and nil, respectively. For the nine months ended September 30, 2021 and 2020 period, amounts written off were were $2.4 million and $2.3 million, respectively.

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- Definition Amount of expense (reversal of expense) for expected credit loss on premiums receivable, from change in methodology. + References No definition available. + Details
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