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REINSURANCE - Summary of Reinsurers (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Net reinsurance balances recoverable      
Prepaid reinsurance premiums and recoverables on paid and unpaid losses and settlement expenses $ 332,900    
Percentage of reinsurance recoverables due from companies with financial strength ratings of "A" or better by A.M. Best and S&P rating services 96.00%    
Number of top reinsurers | item 10    
Reinsurer Exposure $ 332,910    
Ceded Premium Written $ 131,615 $ 160,696 $ 176,873
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 $ 14,000 13,300  
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts $ 11,900 $ 13,100  
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 / HSB | A.M. Best Rating, A+, Superior | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 58,169    
Ceded Premium Written $ 20,273    
Percent of Total Ceded Premium Written 15.40%    
Munich Re / 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 17.50%    
Endurance Re | A.M. Best Rating, A, Excellent | S&P Rating, A, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 47,987    
Ceded Premium Written $ 9,828    
Percent of Total Ceded Premium Written 7.50%    
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 14.40%    
Swiss Re /Westport Ins. Corp. | A.M. Best Rating, A+, Superior | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 33,162    
Ceded Premium Written $ 12,953    
Percent of Total Ceded Premium Written 9.80%    
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 10.00%    
Aspen UK Ltd. | A.M. Best Rating, A, Excellent | S&P Rating, A, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 28,754    
Ceded Premium Written $ 5,618    
Percent of Total Ceded Premium Written 4.30%    
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 8.60%    
Transatlantic Re | A.M. Best Rating, A, Excellent | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 22,447    
Ceded Premium Written $ 7,404    
Percent of Total Ceded Premium Written 5.60%    
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 6.70%    
Berkley Insurance Co. | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 20,974    
Ceded Premium Written $ 4,848    
Percent of Total Ceded Premium Written 3.70%    
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 6.30%    
Scor Reinsurance Co. | A.M. Best Rating, A, Excellent | S&P Rating, AA-, Very Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 13,265    
Ceded Premium Written $ 8,242    
Percent of Total Ceded Premium Written 6.30%    
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 4.00%    
Allied World Re - US | A.M. Best Rating, A, Excellent | S&P Rating, A, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 13,165    
Ceded Premium Written $ 2,544    
Percent of Total Ceded Premium Written 1.90%    
Allied World Re - US | 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 4.00%    
Axis Re | A.M. Best Rating, A+, Superior | S&P Rating, A+, Strong      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 11,552    
Ceded Premium Written $ 4,235    
Percent of Total Ceded Premium Written 3.20%    
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 3.50%    
General Re Member | AM Best, A++ Rating [Member] | Standard & Poor's, AA+ Rating [Member]      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 11,337    
Ceded Premium Written $ 2,702    
Percent of Total Ceded Premium Written 2.10%    
General Re Member | AM Best, A++ Rating [Member] | Standard & Poor's, AA+ Rating [Member] | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 3.40%    
All other reinsurers      
Net reinsurance balances recoverable      
Reinsurer Exposure $ 72,098    
Ceded Premium Written $ 52,968    
Percent of Total Ceded Premium Written 40.20%    
All other reinsurers | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable [Member]      
Net reinsurance balances recoverable      
Percent of Total Net Reinsurer Exposure 21.60%