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REINSURANCE - Summary of Reinsurers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net reinsurance balances recoverable      
Percentage of reinsurance recoverables due from companies with financial strength ratings of "A" or better by A.M. Best and S&P rating services 94.00%    
Reinsurer Exposure $ 469,151    
Ceded Premium Written $ 204,665 $ 160,041 $ 135,458
Percent of Total Ceded Premium Written 100.00%    
Reinsurance balances recoverable as a percentage of shareholder's equity, threshold for disclosure 2.00%    
Amount of allowance for uncollectible amounts on paid recoverables $ 15,700 16,100  
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts $ 9,402 $ 9,793  
Threshold period for including reinsurance receivables in the allowance for uncollectible amounts 1 year    
Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 100.00%    
Munich Re America / HSB | AM Best Rating, A+, Superior | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 68,368    
Ceded Premium Written $ 22,536    
Percent of Total Ceded Premium Written 11.00%    
Munich Re America / HSB | AM Best Rating, A+, Superior | S&P Rating, AA-, Very Strong | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 14.60%    
Swiss Re /Westport Ins. Corp. | AM Best Rating, A+, Superior | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 34,777    
Ceded Premium Written $ 2,801    
Percent of Total Ceded Premium Written 1.40%    
Swiss Re /Westport Ins. Corp. | AM Best Rating, A+, Superior | S&P Rating, AA-, Very Strong | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 7.40%    
Endurance Re | AM Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 32,233    
Ceded Premium Written $ 9,173    
Percent of Total Ceded Premium Written 4.50%    
Endurance Re | AM Best Rating, A+, Superior | S&P Rating, A+, Strong | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 6.90%    
Aspen UK Ltd. | AM Best Rating, A, Excellent | S&P Rating, A, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 31,622    
Ceded Premium Written $ 8,270    
Percent of Total Ceded Premium Written 4.00%    
Aspen UK Ltd. | AM Best Rating, A, Excellent | S&P Rating, A, Strong | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 6.70%    
Berkley Insurance Co. | AM Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 28,798    
Ceded Premium Written $ 8,667    
Percent of Total Ceded Premium Written 4.20%    
Berkley Insurance Co. | AM Best Rating, A+, Superior | S&P Rating, A+, Strong | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 6.10%    
Renaissance Re | AM Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 25,841    
Ceded Premium Written $ 15,754    
Percent of Total Ceded Premium Written 7.70%    
Renaissance Re | AM Best Rating, A+, Superior | S&P Rating, A+, Strong | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 5.50%    
Hannover Ruckversicherung Member | AM Best Rating, A+, Superior | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 24,758    
Ceded Premium Written $ 12,491    
Percent of Total Ceded Premium Written 6.10%    
Hannover Ruckversicherung Member | AM Best Rating, A+, Superior | S&P Rating, AA-, Very Strong | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 5.30%    
Toa-Re | AM Best Rating, A, Excellent | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 23,734    
Ceded Premium Written $ 7,757    
Percent of Total Ceded Premium Written 3.80%    
Toa-Re | AM Best Rating, A, Excellent | S&P Rating, A+, Strong | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 5.10%    
Transatlantic Re | AM Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 22,873    
Ceded Premium Written $ 6,635    
Percent of Total Ceded Premium Written 3.20%    
Transatlantic Re | AM Best Rating, A+, Superior | S&P Rating, A+, Strong | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 4.90%    
General Re | AM Best, A++ Rating | Standard & Poor's, AA+ Rating      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 19,736    
Ceded Premium Written $ 6,240    
Percent of Total Ceded Premium Written 3.00%    
General Re | AM Best, A++ Rating | Standard & Poor's, AA+ Rating | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 4.20%    
Liberty Mutual | AM Best Rating, A, Excellent | S&P Rating, A, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 19,171    
Ceded Premium Written $ 6,696    
Percent of Total Ceded Premium Written 3.30%    
Liberty Mutual | AM Best Rating, A, Excellent | S&P Rating, A, Strong | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 4.10%    
All other reinsurers      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 137,240    
Ceded Premium Written $ 97,645    
Percent of Total Ceded Premium Written 47.80%    
All other reinsurers | Reinsurer Concentration Risk | Reinsurance Recoverable      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 29.20%