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Schedule IV. Supplemental Schedule of Reinsurance Premiums (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
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]                      
Gross Amounts                 $ 98,182 $ 66,027 $ 44,530
Ceded                 466,719 453,658 412,415
Assumed                 1,769,088 1,450,047 1,482,511
Net premiums earned $ 361,575 $ 362,388 $ 379,828 $ 296,760 $ 256,487 $ 258,979 $ 260,416 $ 286,534 $ 1,400,551 $ 1,062,416 $ 1,114,626
Percentage of Amount Assumed to Net                 126.00% 136.00% 133.00%