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Reinsurance - Effects of reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Premiums Written
Direct	$ 7,706,832	$ 6,553,910	$ 5,681,523
Assumed	5,045,655	3,534,158	2,457,437
Ceded	(3,734,150)	(2,650,352)	(2,099,893)
Net premiums written	9,018,337	7,437,716	6,039,067
Premiums Earned
Direct	7,149,794	6,361,451	5,447,829
Assumed	4,333,873	3,213,873	2,337,950
Ceded	(3,401,369)	(2,583,389)	(1,999,281)
Net premiums earned	8,082,298	6,991,935	5,786,498
Losses and Loss Adjustment Expenses
Direct	4,266,758	4,392,392	2,953,072
Assumed	2,826,820	2,204,323	1,602,528
Ceded	(2,508,775)	(1,907,116)	(1,422,148)
Net	$ 4,584,803	$ 4,689,599	$ 3,133,452

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