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Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Credit Loss Allowance Activity
Premium Receivable, Allowance for Credit Loss	$ 25	$ 132	$ 140	$ 165
Reinsurance Recoverable, Allowance for Credit Loss	768	368	386	256
Financing Receivable, Allowance for Credit Loss	0	51	20	141
Total Credit Loss Allowances	793	551	$ 546	$ 562
Premium Receivable, Credit Loss Expense (Reversal)	(176)	(235)
Reinsurance Recoverable, Credit Loss Expense (Reversal)	382	112
Financing Receivable, Credit Loss, Expense (Reversal)	(20)	(90)
Total Credit Loss Allowance Expenses	186	(213)
Premium Receivable, Allowance for Credit Loss, Writeoff	61	202
Reinsurance recoverable, allowance for credit loss, writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Total Credit Loss Allowance Writeoffs	$ 61	$ 202

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