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REINSURANCE (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Premiums written
Gross									$ 6,826,938	$ 6,898,858	$ 6,910,065
Ceded									(2,490,529)	(2,409,243)	(2,251,103)
Net									4,336,409	4,489,615	4,658,962
Premiums earned
Gross									6,768,733	6,910,677	6,882,217
Ceded									(2,397,424)	(2,323,499)	(2,090,722)
Net	$ 1,087,368	$ 1,091,312	$ 1,104,003	$ 1,088,625	$ 1,172,051	$ 1,157,307	$ 1,123,607	$ 1,134,212	4,371,309	4,587,178	4,791,495
Reinsurance receivables:
Ceded losses and loss expenses									1,914,000	1,602,000	1,565,000
Provision for unrecoverable reinsurance	$ 23,711				$ 18,000				$ 23,711	$ 18,000	$ 21,000

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