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Allowance for Expected Credit Losses
12 Months Ended
Dec. 31, 2021
Credit Loss [Abstract]  
Allowance for expected credit losses
Premiums Receivable
The following table provides a roll forward of the allowance for expected credit losses of the Company’s premium receivables:
Year Ended December 31, 2021Premium Receivables, Net of AllowanceAllowance for Expected Credit Losses
Balance at beginning of period$2,064,586 $37,781 
Change for provision of expected credit losses (2)2,177 
Balance at end of period$2,633,280 $39,958 
Year Ended December 31, 2020
Balance at beginning of period$1,778,717 $21,003 
Cumulative effect of accounting change (1)6,539 
Change for provision of expected credit losses (2)10,239 
Balance at end of period$2,064,586 $37,781 
(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 and 2020 periods, amounts written off totaled $3.8 million and $2.8 million, respectively.
Reinsurance Recoverables
The Company monitors the financial condition of its reinsurers and attempts to place coverages only with substantial, financially sound carriers. Although the Company has not experienced any material credit losses to date, an inability of its reinsurers or retrocessionaires to meet their obligations to it over the relevant exposure periods for any reason could have a material adverse effect on its financial condition and results of operations.
The following table provides a roll forward of the allowance for expected credit losses of the Company’s reinsurance recoverables:
Year Ended December 31, 2021Reinsurance Recoverables, Net of AllowanceAllowance for Expected Credit Losses
Balance at beginning of period$4,500,802 $11,636 
Change for provision of expected credit losses1,594 
Balance at end of period$5,880,735 $13,230 
Year Ended December 31, 2020
Balance at beginning of period$4,346,816 $1,364 
Cumulative effect of accounting change (1)12,010 
Change for provision of expected credit losses(1,738)
Balance at end of period4,500,802 $11,636 
(1) Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”.

The following table summarizes the Company’s reinsurance recoverables on paid and unpaid losses (not including ceded unearned premiums) at December 31, 2021 and 2020:
December 31,
20212020
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses$5,880,735$4,500,802
% due from carriers with A.M. Best rating of “A-” or better69.7 %63.9 %
% due from all other rated carriers0.1 %0.1 %
% due from all other carriers with no A.M. Best rating (1)30.2 %36.0 %
Largest balance due from any one carrier as % of total shareholders’ equity (2)6.7 %1.8 %
(1)    At December 31, 2021 and 2020 period, over 91% and 94% of such amount is collateralized through reinsurance trusts, funds withheld arrangements, letters of credit or other, respectively.
(2)    The 2021 period included impact of deconsolidation of Somers. See note 12.
Contractholder Receivables
The following table provides a roll forward of the allowance for expected credit losses of the Company’s contractholder receivables:
Year Ended December 31, 2021Contractholder Receivables, Net of AllowanceAllowance for Expected Credit Losses
Balance at beginning of period$1,986,924 $8,638 
Change for provision of expected credit losses(5,201)
Balance at end of period$1,828,691 $3,437 
Year Ended December 31, 2020
Balance at beginning of period$2,119,460 $— 
Cumulative effect of accounting change (1)6,663 
Change for provision of expected credit losses1,975 
Balance at end of period1,986,924 $8,638 
(1) Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”.