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HISTORICAL LOSS AND LAE DEVELOPMENT - Unpaid Losses and Settlement Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unpaid losses and LAE at beginning of year:      
Gross $ 1,461,348 $ 1,271,503 $ 1,139,337
Ceded (364,999) (301,991) (288,224)
Net 1,096,349 969,512 851,113
Increase (decrease) in incurred losses and LAE:      
Current accident year 488,700 478,143 440,452
Prior accident years (75,284) (49,950) (38,868)
Total incurred 413,416 428,193 401,584
Loss and LAE payments for claims incurred:      
Current accident year (80,055) (76,050) (73,392)
Prior accident year (239,875) (225,306) (209,793)
Total paid (319,930) (301,356) (283,185)
Net 1,189,835 1,096,349 969,512
Unpaid losses and LAE at year end      
Gross 1,574,352 1,461,348 1,271,503
Ceded (384,517) (364,999) (301,991)
Net 1,189,835 1,096,349 969,512
Casualty segment      
Increase (decrease) in incurred losses and LAE:      
Current accident year 392,653 363,015 323,141
Prior accident years (62,497) (33,252) (17,462)
Property segment      
Unpaid losses and LAE at beginning of year:      
Ceded (50,495)    
Increase (decrease) in incurred losses and LAE:      
Current accident year 78,075 94,635 97,161
Prior accident years (4,461) (10,813) (12,134)
Unpaid losses and LAE at year end      
Ceded (21,438) (50,495)  
Surety segment      
Unpaid losses and LAE at beginning of year:      
Ceded (11,834)    
Increase (decrease) in incurred losses and LAE:      
Current accident year 17,972 20,493 20,150
Prior accident years (8,326) (5,885) $ (9,272)
Unpaid losses and LAE at year end      
Ceded $ (11,199) $ (11,834)