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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance $ 1,166,388                  
Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 624,701                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2009, net of reinsurance 31,672                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 496,332                  
Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 1,078,561                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2009, net of reinsurance 522                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 103,575                  
Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 980,073                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2009, net of reinsurance 56                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 338,664                  
Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 357,235                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2009, net of reinsurance 20,232                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 168,554                  
Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 416,761                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2009, net of reinsurance 1,418                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 26,668                  
2009 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 72,673 $ 70,814 $ 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 88,334 88,159 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 63,506 63,508 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 33,313 33,117 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 31,849 31,837 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 63,300 62,070 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 83,942 83,915 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 67,853 67,852 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 39,208 38,973 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 33,154 33,158 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 64,541 62,165 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 120,731 120,178 118,183 116,614 112,497 109,429 104,800 85,585    
2011 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 89,459 88,609 87,475 85,348 79,383 65,021 50,931 34,332    
2011 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 29,700 29,453 29,022 28,247 27,497 26,033 21,678 10,322    
2011 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 46,650 46,575 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]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 71,773 69,800 64,574 55,316 39,948 24,620 6,875      
2012 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 106,740 106,521 105,250 103,197 100,078 94,380 71,008      
2012 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 94,747 93,179 90,292 82,944 71,469 57,201 39,247      
2012 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 35,388 34,330 33,063 30,933 28,397 23,023 11,802      
2012 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 44,158 44,139 43,569 44,448 43,375 41,979 $ 30,415      
2013 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 72,115 65,773 54,559 39,953 25,228 9,835        
2013 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 91,493 89,200 86,115 82,853 78,226 59,331        
2013 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 100,058 96,375 90,780 79,663 67,630 43,592        
2013 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 47,071 45,078 42,941 38,023 30,209 14,136        
2013 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 36,323 36,155 35,306 34,297 32,788 $ 25,505        
2014 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 83,109 70,363 50,211 29,679 10,207          
2014 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 123,697 122,370 116,750 113,663 84,456          
2014 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 109,682 99,922 87,590 68,033 45,704          
2014 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 45,193 42,964 38,441 30,289 13,965          
2014 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 52,018 51,837 49,710 47,912 $ 37,055          
2015 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 74,292 53,901 27,182 11,185            
2015 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 101,367 95,515 90,454 67,217            
2015 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 118,395 99,201 78,225 50,782            
2015 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 38,424 35,229 27,304 12,063            
2015 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 39,428 39,027 37,431 $ 29,551            
2016 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 63,526 38,184 13,782              
2016 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 132,429 125,962 92,895              
2016 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 128,157 103,528 66,013              
2016 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 40,680 32,345 14,413              
2016 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 42,660 40,910 $ 32,999              
2017 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 43,172 17,716                
2017 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 137,058 99,484                
2017 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 126,644 81,311                
2017 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 31,309 14,647                
2017 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 53,111 $ 42,135                
2018 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 16,200                  
2018 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 92,770                  
2018 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 81,572                  
2018 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 16,949                  
2018 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance $ 37,410