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REINSURANCE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Premiums written
Gross	$ 8,214,595	$ 7,685,984	$ 6,826,938
Ceded	(2,951,539)	(2,759,360)	(2,490,529)
Net	5,263,056	4,926,624	4,336,409
Premiums earned
Gross	7,936,382	7,281,709	6,768,733
Ceded	(2,776,056)	(2,571,859)	(2,397,424)
Net	5,160,326	4,709,850	4,371,309
Reinsurance receivables:
Ceded losses and loss expenses	1,754,000	1,782,000	1,914,000
Allowance for credit losses on reinsurance recoverable for unpaid losses and loss expenses	$ 30,715	$ 29,554	$ 24,000

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