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v3.21.2

Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Credit Loss [Abstract] |  |  |  |  |
Balance at beginning of period |  | $ 2,618,175 | $ 2,155,204 | $ 2,064,586 | $ 1,778,717
Balance at end of period |  | 2,866,578 | 2,203,753 | 2,866,578 | 2,203,753
Allowance for Expected Credit Losses |  |  |  |  |
Balance at beginning of period |  | 36,111 | 27,990 | 37,781 | 21,003
Cumulative effect of accounting change (1) | [1] |  |  |  | 6,539
Change for provision of expected credit losses (1) | [2] | (132) | 8,064 | (1,802) | 8,512
Balance at end of period |  | 35,979 | 36,054 | 35,979 | 36,054
Write-offs charged against the allowance |  | $ 1,100 | $ 1,800 | $ 1,200 | $ 2,300
Accounting Standards Update |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |
[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 second quarter and 2020 second quarter, amounts written off were $1.1 million and $1.8 million, respectively. For the six months ended June 30, 2021 and 2020 period, amounts written off were were $1.2 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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