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REINSURANCE - Summary of Premiums and Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
REINSURANCE      
Maximum amount beyond which net loss on any individual risk is limited through the purchase of reinsurance $ 3,000    
WRITTEN      
Direct 848,153 $ 844,430 $ 819,130
Reinsurance assumed 37,159 30,434 34,456
Reinsurance ceded (135,458) (133,912) (131,615)
Net 749,854 740,952 721,971
EARNED      
Direct 835,118 835,294 797,180
Reinsurance assumed 32,521 27,886 35,724
Reinsurance ceded (129,702) (134,572) (132,743)
Net amount 737,937 728,608 700,161
LOSSES AND SETTLEMENT EXPENSES INCURRED      
Direct 486,986 405,873 307,445
Reinsurance assumed 16,072 13,196 23,184
Reinsurance ceded (101,474) (69,291) (31,584)
Net $ 401,584 $ 349,778 $ 299,045