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REINSURANCE - Summary of Reinsurers (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Net reinsurance balances recoverable      
Prepaid reinsurance premiums and recoverables on paid and unpaid losses and settlement expenses $ 333,400    
Percentage of reinsurance recoverables due from companies with financial strength ratings of "A" or better by A.M. Best and S&P rating services 95.00%    
Number of top reinsurers | item 10    
Reinsurer Exposure $ 333,360    
Ceded Premium Written $ 133,912 $ 131,615 $ 160,696
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 $ 15,200 14,000  
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts $ 10,699 $ 11,885  
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 $ 52,435    
Ceded Premium Written $ 23,347    
Percent of Total Ceded Premium Written 17.40%    
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 15.70%    
Swiss Re /Westport Ins. Corp. | A.M. Best Rating, A+, Superior | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 41,997    
Ceded Premium Written $ 15,157    
Percent of Total Ceded Premium Written 11.30%    
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 12.60%    
Endurance Re | A.M. Best Rating, A, Excellent | S&P Rating, A, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 37,082    
Ceded Premium Written $ 6,412    
Percent of Total Ceded Premium Written 4.80%    
Endurance 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 11.10%    
Aspen UK Ltd. | A.M. Best Rating, A, Excellent | S&P Rating, A, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 26,886    
Ceded Premium Written $ 6,722    
Percent of Total Ceded Premium Written 5.00%    
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 8.10%    
Transatlantic Re | A.M. Best Rating, A, Excellent | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 17,222    
Ceded Premium Written $ 6,306    
Percent of Total Ceded Premium Written 4.70%    
Transatlantic 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 5.20%    
General Re | AM Best, A++ Rating [Member] | Standard & Poor's, AA Rating      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 16,531    
Ceded Premium Written $ 2,957    
Percent of Total Ceded Premium Written 2.20%    
General Re | AM Best, A++ Rating [Member] | Standard & Poor's, AA Rating | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 5.00%    
Berkley Insurance Co. | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 16,314    
Ceded Premium Written $ 5,388    
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 4.90%    
Scor Reinsurance Co. | A.M. Best Rating, A, Excellent | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 15,767    
Ceded Premium Written $ 5,069    
Percent of Total Ceded Premium Written 3.80%    
Scor Reinsurance Co. | A.M. Best Rating, A, Excellent | S&P Rating, AA-, Very Strong | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 4.70%    
Axis Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 11,999    
Ceded Premium Written $ 4,093    
Percent of Total Ceded Premium Written 3.10%    
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 3.60%    
Toa-Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 11,809    
Ceded Premium Written $ 4,353    
Percent of Total Ceded Premium Written 3.30%    
Toa-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 3.50%    
All other reinsurers      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 85,318    
Ceded Premium Written $ 54,108    
Percent of Total Ceded Premium Written 40.40%    
All other reinsurers | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 25.60%