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Schedule IV - Reinsurance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property and Liability      
Premiums earned $ 772,968 $ 755,623 $ 568,629
Premiums ceded (101,510) (68,879) (41,514)
Premiums assumed 22,691 12,987 804
Net premiums earned $ 694,149 $ 699,731 $ 527,919
Percentage of amount assumed to net 3.27% 1.86% 0.15%