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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance $ 1,347,699                  
Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 760,031                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2011, net of reinsurance 35,801                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 585,811                  
Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 1,242,097                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2011, net of reinsurance 723                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 129,290                  
Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 1,311,376                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2011, net of reinsurance (80)                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 434,293                  
Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 380,733                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2011, net of reinsurance 19,345                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 116,050                  
Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 477,746                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2011, net of reinsurance 620                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 39,210                  
2011 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 68,052 $ 66,500 $ 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 121,157 121,063 120,731 120,178 118,183 116,614 112,497 109,429 104,800 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 90,677 90,515 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 30,573 29,890 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 46,751 46,752 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 74,644 73,819 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 108,123 107,992 106,740 106,521 105,250 103,197 100,078 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 96,176 94,983 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 36,520 36,060 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 44,159 44,158 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 78,448 75,961 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 92,472 92,012 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 103,037 101,580 100,058 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 48,093 47,572 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 36,466 36,397 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 96,509 93,060 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 126,307 125,745 123,697 122,370 116,750 113,663 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 116,843 113,751 109,682 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 46,299 45,825 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 52,519 52,543 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 104,472 96,339 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 103,975 104,115 101,367 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 134,100 129,317 118,395 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 40,034 39,305 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 40,029 39,865 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 102,757 88,885 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 139,353 137,909 132,429 125,962 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 164,341 148,224 128,157 103,528 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 47,082 45,743 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 44,618 44,046 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 91,984 70,500 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 152,219 145,900 137,058 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 197,893 166,170 126,644 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 41,672 38,083 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 57,169 55,982 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 79,168 44,772 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 133,703 123,559 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 187,405 138,092 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 43,189 35,369 16,949              
2018 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 49,464 47,433 $ 37,410              
2019 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 46,986 18,221                
2019 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 136,084 100,980                
2019 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 153,244 91,919                
2019 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 29,668 13,582                
2019 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 52,390 $ 40,544                
2020 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 17,011                  
2020 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 128,704                  
2020 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 67,660                  
2020 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 17,603                  
2020 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance $ 54,181