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HISTORICAL LOSS AND LAE DEVELOPMENT - Unpaid Losses and Settlement Expenses (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Unpaid losses and LAE at beginning of year:    
Gross $ 1,271,503 $ 1,139,337
Ceded (301,991) (288,224)
Net 969,512 851,113
Increase (decrease) in incurred losses and LAE:    
Current accident year 222,121 203,371
Prior accident years (28,047) (19,634)
Total incurred 194,074 183,737
Loss and LAE payments for claims incurred:    
Current accident year (16,805) (18,732)
Prior accident year (118,650) (113,501)
Total paid (135,455) (132,233)
Net 1,028,131 902,617
Unpaid losses and LAE at year end    
Gross 1,343,248 1,183,185
Ceded (315,117) (280,568)
Net $ 1,028,131 $ 902,617