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SCHEDULE IV - Reinsurance (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reinsurance Premiums For Insurance Companies By Product Segment Net Amount [Abstract]
Gross amount									$ 93,091	$ 84,815	$ 73,567
Ceded Premiums Earned									175,656	155,010	141,539
Assumed Premiums Earned									5,280,775	4,556,134	4,715,726
Net amount	1,421,000	1,421,000	1,209,000	1,147,000	1,168,000	1,237,000	1,091,000	990,000	5,198,210	4,485,939	4,647,754
Percentage of amount assumed to net									102.00%	102.00%	101.00%
Life reinsurance in force
Gross amount									0	0	0
Ceded to other companies									1,629,920	1,782,549	1,673,196
Assumed from other companies									211,247,212	214,006,823	199,347,294
Net amount									209,617,292	212,224,274	197,674,098
Percentage of amount assumed to net									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 Premiums Earned									5,000	5,400	3,470
Assumed Premiums Earned									821,737	780,279	774,383
Net amount									816,737	774,879	770,913
Percentage of amount assumed to net									101.00%	101.00%	100.00%
Accident and health [Member]
Reinsurance Premiums For Insurance Companies By Product Segment Net Amount [Abstract]
Gross amount									0	0	0
Ceded Premiums Earned									2,912	0	0
Assumed Premiums Earned									143,321	19,719	21,235
Net amount									140,409	19,719	21,235
Percentage of amount assumed to net									102.00%	100.00%	100.00%
Property and casualty [Member]
Reinsurance Premiums For Insurance Companies By Product Segment Net Amount [Abstract]
Gross amount									93,091	84,815	73,567
Ceded Premiums Earned									167,744	149,610	138,069
Assumed Premiums Earned									4,315,717	3,756,136	3,920,108
Net amount									$ 4,241,064	$ 3,691,341	$ 3,855,606
Percentage of amount assumed to net									102.00%	102.00%	102.00%