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REINSURANCE (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Premiums written
Gross									$ 6,898,858	$ 6,910,065	$ 5,556,273
Ceded									(2,409,243)	(2,251,103)	(1,529,130)
Net									4,489,615	4,658,962	4,027,143
Premiums earned
Gross									6,910,677	6,882,217	5,616,234
Ceded									(2,323,499)	(2,090,722)	(1,467,474)
Net	$ 1,172,051	$ 1,157,307	$ 1,123,607	$ 1,134,212	$ 1,214,469	$ 1,224,075	$ 1,185,548	$ 1,167,402	4,587,178	4,791,495	4,148,760
Reinsurance receivables:
Ceded losses and loss expenses									1,602,000	1,565,000	1,010,000
Provision for unrecoverable reinsurance	$ 18,000				$ 21,000				$ 18,000	$ 21,000	$ 17,000

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