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REINSURANCE - Summary of Reinsurers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 93.00%    
Reinsurer Exposure $ 429,987    
Ceded Premium Written $ 160,041 $ 135,458 $ 133,912
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 $ 16,100 15,900  
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts $ 9,793 $ 10,014  
Threshold period for including reinsurance receivables in the allowance for uncollectible amounts 1 year    
Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 100.00%    
Munich Re America / HSB | A.M. Best Rating, A+, Superior | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 73,593    
Ceded Premium Written $ 24,479    
Percent of Total Ceded Premium Written 15.30%    
Munich Re America / HSB | A.M. Best Rating, A+, Superior | S&P Rating, AA-, Very Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 17.10%    
Swiss Re /Westport Ins. Corp. | A.M. Best Rating, A+, Superior | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 35,095    
Ceded Premium Written $ 2,100    
Percent of Total Ceded Premium Written 1.30%    
Swiss Re /Westport Ins. Corp. | A.M. Best Rating, A+, Superior | S&P Rating, AA-, Very Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 8.20%    
Endurance Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 28,754    
Ceded Premium Written $ 6,000    
Percent of Total Ceded Premium Written 3.80%    
Endurance Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 6.70%    
Aspen UK Ltd. | A.M. Best Rating, A, Excellent | S&P Rating, A, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 27,735    
Ceded Premium Written $ 7,906    
Percent of Total Ceded Premium Written 4.90%    
Aspen UK Ltd. | A.M. Best Rating, A, Excellent | S&P Rating, A, Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 6.40%    
Berkley Insurance Co. | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 23,267    
Ceded Premium Written $ 6,335    
Percent of Total Ceded Premium Written 4.00%    
Berkley Insurance Co. | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 5.40%    
Hannover Ruckversicherung Member | A.M. Best Rating, A+, Superior | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 22,629    
Ceded Premium Written $ 9,458    
Percent of Total Ceded Premium Written 5.90%    
Hannover Ruckversicherung Member | A.M. Best Rating, A+, Superior | S&P Rating, AA-, Very Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 5.30%    
Axis Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 19,928    
Ceded Premium Written $ 6,424    
Percent of Total Ceded Premium Written 4.00%    
Axis Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 4.60%    
Transatlantic Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 19,517    
Ceded Premium Written $ 7,911    
Percent of Total Ceded Premium Written 4.90%    
Transatlantic Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 4.50%    
Toa-Re | A.M. Best Rating, A, Excellent | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 18,480    
Ceded Premium Written $ 6,495    
Percent of Total Ceded Premium Written 4.10%    
Toa-Re | A.M. Best Rating, A, Excellent | S&P Rating, A+, Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 4.30%    
General Re | AM Best, A++ Rating | Standard & Poor's, AA+ Rating      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 18,168    
Ceded Premium Written $ 5,170    
Percent of Total Ceded Premium Written 3.20%    
General Re | AM Best, A++ Rating | Standard & Poor's, AA+ Rating | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 4.20%    
Tokio Millennium Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 17,044    
Ceded Premium Written $ 6,947    
Percent of Total Ceded Premium Written 4.30%    
Tokio Millennium Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 4.00%    
All other reinsurers      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 125,777    
Ceded Premium Written $ 70,816    
Percent of Total Ceded Premium Written 44.30%    
All other reinsurers | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 29.30%