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Schedule IV. Supplemental Schedule of Reinsurance Premiums (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
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]
Gross Amounts									$ 536,595	$ 404,525	$ 292,219
Ceded to Other Companies									1,662,815	1,414,383	1,095,886
Assumed									5,078,682	4,348,261	2,779,796
Net premiums earned (Note 7)	$ 1,029,085	$ 1,000,183	$ 1,010,096	$ 913,098	$ 970,125	$ 906,748	$ 911,502	$ 550,028	$ 3,952,462	$ 3,338,403	$ 1,976,129
Percentage of Amount Assumed to Net									128.00%	130.00%	141.00%

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