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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES (Cumulative Paid Claims and Allocated Claim Adjustment Expenses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance $ 980,636                  
Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 514,858                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 26,712                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 458,261                  
Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 970,467                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 564                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 97,785                  
Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 773,352                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 137                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 209,984                  
Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 318,016                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 20,072                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 160,303                  
Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 380,655                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 1,800                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 27,793                  
2007 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 61,499 $ 60,429 $ 59,085 $ 56,838 $ 53,663 $ 51,337 $ 41,306 $ 31,120 $ 17,542 $ 6,054
2007 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 71,406 71,376 71,360 71,178 70,960 68,928 63,329 59,322 56,759 40,578
2007 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 68,834 68,794 68,439 68,074 67,634 65,798 62,272 53,231 42,688 27,058
2007 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 29,577 29,444 29,212 27,922 27,330 26,284 24,768 22,444 18,220 8,246
2007 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 27,311 27,311 27,259 27,260 27,257 27,214 26,840 26,073 25,024 $ 19,900
2008 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 59,052 55,843 52,659 50,143 47,112 42,545 34,482 24,096 9,220  
2008 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 118,003 117,690 117,553 115,897 115,804 112,678 107,480 102,804 80,005  
2008 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 73,018 72,990 72,984 72,122 70,459 68,629 58,926 47,271 30,527  
2008 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 35,292 34,862 34,319 33,770 31,980 30,123 25,736 21,227 10,082  
2008 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 42,787 42,748 42,748 42,627 42,613 42,414 41,735 40,114 $ 32,032  
2009 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 67,733 63,149 56,789 50,098 41,696 32,073 21,151 8,375    
2009 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 88,037 87,721 87,544 86,930 82,809 77,732 72,181 53,219    
2009 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 63,503 63,495 62,732 61,398 58,087 53,451 44,867 27,674    
2009 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 32,911 31,886 31,003 29,898 27,747 24,189 20,292 10,478    
2009 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 31,804 31,718 31,644 31,564 30,829 29,801 27,926 $ 22,086    
2010 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 60,116 56,761 51,336 35,043 24,577 15,230 7,103      
2010 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 83,374 83,000 82,037 80,352 78,284 72,271 52,660      
2010 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 67,622 65,169 62,231 57,947 52,953 41,141 29,329      
2010 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 35,052 34,143 33,119 31,887 28,765 22,606 11,821      
2010 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 33,165 32,997 32,771 32,076 31,340 29,867 $ 24,499      
2011 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 56,150 50,146 40,595 26,260 13,670 6,236        
2011 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 118,183 116,614 112,497 109,429 104,800 85,585        
2011 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 87,475 85,348 79,383 65,021 50,931 34,332        
2011 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 29,022 28,247 27,497 26,033 21,678 10,322        
2011 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 46,573 46,487 45,949 45,306 43,801 $ 36,489        
2012 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 64,574 55,316 39,948 24,620 6,875          
2012 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 105,250 103,197 100,078 94,380 71,008          
2012 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 90,292 82,944 71,469 57,201 39,247          
2012 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 33,063 30,933 28,397 23,023 11,802          
2012 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 43,569 44,448 43,375 41,979 $ 30,415          
2013 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 54,559 39,953 25,228 9,835            
2013 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 86,115 82,853 78,226 59,331            
2013 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 90,780 79,663 67,630 43,592            
2013 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 42,941 38,023 30,209 14,136            
2013 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 35,306 34,297 32,788 $ 25,505            
2014 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 50,211 29,679 10,207              
2014 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 116,750 113,663 84,456              
2014 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 87,590 68,033 45,704              
2014 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 38,441 30,289 13,965              
2014 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 49,710 47,912 $ 37,055              
2015 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 27,182 11,185                
2015 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 90,454 67,217                
2015 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 78,225 50,782                
2015 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 27,304 12,063                
2015 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 37,431 $ 29,551                
2016 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 13,782                  
2016 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 92,895                  
2016 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 66,013                  
2016 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 14,413                  
2016 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 32,999