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SCHEDULE IV - Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reinsurance Premiums For Insurance Companies By Product Segment Net Amount [Abstract]
Gross amount									$ 252,577	$ 209,479	$ 93,091
Ceded to other companies									301,143	215,203	175,656
Assumed from other companies									5,317,744	5,614,919	5,280,775
Net amount	$ 1,294,000	$ 1,412,000	$ 1,328,000	$ 1,235,000	$ 1,446,000	$ 1,557,000	$ 1,353,000	$ 1,254,000	$ 5,269,178	$ 5,609,195	$ 5,198,210
Percentage of amount assumed to net									101.00%	100.00%	102.00%
Life reinsurance in force
Gross amount	0				0				$ 0	$ 0	$ 0
Ceded to other companies	2,189,254				2,322,845				2,189,254	2,322,845	1,629,920
Assumed from other companies	180,825,066				198,284,805				180,825,066	198,284,805	211,247,212
Net amount	$ 178,635,812				$ 195,961,960				$ 178,635,812	$ 195,961,960	$ 209,617,292
Percentage of amount assumed to net	101.00%				101.00%				101.00%	101.00%	101.00%
Life [Member]
Reinsurance Premiums For Insurance Companies By Product Segment Net Amount [Abstract]
Gross amount									$ 0	$ 0	$ 0
Ceded to other companies									4,802	5,031	5,000
Assumed from other companies									873,854	943,054	821,737
Net amount									$ 869,052	$ 938,023	$ 816,737
Percentage of amount assumed to net									101.00%	101.00%	101.00%
Accident and health [Member]
Reinsurance Premiums For Insurance Companies By Product Segment Net Amount [Abstract]
Gross amount									$ 89,535	$ 66,090	$ 0
Ceded to other companies									57,978	40,065	2,912
Assumed from other companies									308,904	257,703	143,321
Net amount									$ 340,461	$ 283,728	$ 140,409
Percentage of amount assumed to net									91.00%	91.00%	102.00%
Property and casualty [Member]
Reinsurance Premiums For Insurance Companies By Product Segment Net Amount [Abstract]
Gross amount									$ 163,042	$ 143,389	$ 93,091
Ceded to other companies									238,363	170,107	167,744
Assumed from other companies									4,134,986	4,414,162	4,315,717
Net amount									$ 4,059,665	$ 4,387,444	$ 4,241,064
Percentage of amount assumed to net									102.00%	101.00%	102.00%