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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES (Incurred Claims and Allocated Claim Adjustment Expenses) (Details)
claim in Thousands, $ in Thousands
Dec. 31, 2016
USD ($)
claim
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 946,406                  
Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 1,067,687                  
Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 983,198                  
Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 458,249                  
Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 406,647                  
2007 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 76,049 $ 74,956 $ 76,130 $ 76,740 $ 61,811 $ 67,115 $ 72,407 $ 71,032 $ 64,117 $ 64,793
Total of incurred but not reported liabilities plus expected development on reported claims 12,056                  
Cumulative development $ 11,256                  
Cumulative number of reported claims | claim 6,948                  
2007 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 71,569 71,542 71,454 71,495 87,407 89,160 88,746 89,790 90,694 94,762
Total of incurred but not reported liabilities plus expected development on reported claims 14                  
Cumulative development $ (23,193)                  
Cumulative number of reported claims | claim 18,351                  
2007 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 68,872 68,900 68,756 68,986 69,368 69,802 69,968 67,566 68,864 71,186
Total of incurred but not reported liabilities plus expected development on reported claims 5                  
Cumulative development $ (2,314)                  
Cumulative number of reported claims | claim 15,851                  
2007 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 31,255 31,095 31,200 32,276 31,945 31,933 32,986 33,430 35,972 36,494
Total of incurred but not reported liabilities plus expected development on reported claims 261                  
Cumulative development $ (5,239)                  
Cumulative number of reported claims | claim 4,660                  
2007 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 27,345 27,368 27,384 27,376 27,427 27,521 27,837 28,074 28,358 $ 29,005
Total of incurred but not reported liabilities plus expected development on reported claims 34                  
Cumulative development $ (1,660)                  
Cumulative number of reported claims | claim 12,703                  
2008 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 74,915 74,115 75,178 78,152 63,231 73,892 81,963 84,944 79,455  
Total of incurred but not reported liabilities plus expected development on reported claims 14,050                  
Cumulative development $ (4,540)                  
Cumulative number of reported claims | claim 6,506                  
2008 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 118,329 118,376 118,115 116,940 134,821 140,321 138,602 141,384 157,303  
Total of incurred but not reported liabilities plus expected development on reported claims 64                  
Cumulative development $ (38,974)                  
Cumulative number of reported claims | claim 21,086                  
2008 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 73,463 73,431 73,506 75,021 75,070 76,527 76,051 78,391 80,461  
Total of incurred but not reported liabilities plus expected development on reported claims 68                  
Cumulative development $ (6,998)                  
Cumulative number of reported claims | claim 18,113                  
2008 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 39,768 39,680 39,386 40,010 40,474 41,278 39,895 42,301 42,739  
Total of incurred but not reported liabilities plus expected development on reported claims 564                  
Cumulative development $ (2,971)                  
Cumulative number of reported claims | claim 5,035                  
2008 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 42,882 43,482 43,515 43,535 43,577 43,672 43,408 44,686 $ 49,961  
Total of incurred but not reported liabilities plus expected development on reported claims 70                  
Cumulative development $ (7,079)                  
Cumulative number of reported claims | claim 15,821                  
2009 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 86,757 85,761 83,660 84,286 65,831 73,545 85,991 88,298    
Total of incurred but not reported liabilities plus expected development on reported claims 15,018                  
Cumulative development $ (1,541)                  
Cumulative number of reported claims | claim 5,915                  
2009 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 88,891 87,932 87,845 87,751 105,614 105,031 106,085 113,754    
Total of incurred but not reported liabilities plus expected development on reported claims 188                  
Cumulative development $ (24,863)                  
Cumulative number of reported claims | claim 18,017                  
2009 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 63,567 63,560 63,605 64,516 64,121 68,569 69,328 80,021    
Total of incurred but not reported liabilities plus expected development on reported claims 38                  
Cumulative development $ (16,454)                  
Cumulative number of reported claims | claim 15,018                  
2009 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 35,026 36,014 36,158 36,823 36,837 36,294 39,009 43,560    
Total of incurred but not reported liabilities plus expected development on reported claims 392                  
Cumulative development $ (8,534)                  
Cumulative number of reported claims | claim 4,243                  
2009 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 32,070 32,085 32,029 32,134 32,026 31,945 33,519 $ 34,597    
Total of incurred but not reported liabilities plus expected development on reported claims 140                  
Cumulative development $ (2,527)                  
Cumulative number of reported claims | claim 13,501                  
2010 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 78,291 77,948 78,564 82,865 65,299 69,533 88,987      
Total of incurred but not reported liabilities plus expected development on reported claims 15,154                  
Cumulative development $ (10,696)                  
Cumulative number of reported claims | claim 5,060                  
2010 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 83,981 83,767 83,932 83,836 108,246 106,152 113,139      
Total of incurred but not reported liabilities plus expected development on reported claims 205                  
Cumulative development $ (29,158)                  
Cumulative number of reported claims | claim 16,647                  
2010 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 68,086 67,296 67,563 67,015 65,860 68,068 75,781      
Total of incurred but not reported liabilities plus expected development on reported claims 121                  
Cumulative development $ (7,695)                  
Cumulative number of reported claims | claim 16,239                  
2010 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 41,468 41,422 40,647 41,167 41,180 42,531 38,210      
Total of incurred but not reported liabilities plus expected development on reported claims 745                  
Cumulative development $ 3,258                  
Cumulative number of reported claims | claim 3,923                  
2010 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 33,432 33,413 33,403 33,865 33,928 34,347 $ 36,686      
Total of incurred but not reported liabilities plus expected development on reported claims 201                  
Cumulative development $ (3,254)                  
Cumulative number of reported claims | claim 13,312                  
2011 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 80,801 79,591 88,200 88,371 64,738 81,522        
Total of incurred but not reported liabilities plus expected development on reported claims 17,772                  
Cumulative development $ (721)                  
Cumulative number of reported claims | claim 5,193                  
2011 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 120,219 119,820 120,492 117,082 142,330 148,220        
Total of incurred but not reported liabilities plus expected development on reported claims 519                  
Cumulative development $ (28,001)                  
Cumulative number of reported claims | claim 15,989                  
2011 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 91,336 92,379 92,519 90,750 87,299 84,887        
Total of incurred but not reported liabilities plus expected development on reported claims 647                  
Cumulative development $ 6,449                  
Cumulative number of reported claims | claim 15,224                  
2011 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 33,314 33,585 34,309 35,352 38,481 39,967        
Total of incurred but not reported liabilities plus expected development on reported claims 640                  
Cumulative development $ (6,653)                  
Cumulative number of reported claims | claim 3,799                  
2011 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 47,013 46,968 47,035 47,090 48,534 $ 50,014        
Total of incurred but not reported liabilities plus expected development on reported claims 300                  
Cumulative development $ (3,001)                  
Cumulative number of reported claims | claim 14,839                  
2012 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 92,537 91,980 94,195 96,158 100,389          
Total of incurred but not reported liabilities plus expected development on reported claims 21,130                  
Cumulative development $ (7,852)                  
Cumulative number of reported claims | claim 5,426                  
2012 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 107,958 108,047 108,774 110,448 138,602          
Total of incurred but not reported liabilities plus expected development on reported claims 735                  
Cumulative development $ (30,644)                  
Cumulative number of reported claims | claim 6,361                  
2012 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 96,594 95,321 94,755 90,848 100,039          
Total of incurred but not reported liabilities plus expected development on reported claims 1,127                  
Cumulative development $ (3,445)                  
Cumulative number of reported claims | claim 14,335                  
2012 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 38,553 38,423 42,158 46,279 48,848          
Total of incurred but not reported liabilities plus expected development on reported claims 716                  
Cumulative development $ (10,295)                  
Cumulative number of reported claims | claim 3,687                  
2012 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 44,715 46,150 46,403 46,199 $ 47,924          
Total of incurred but not reported liabilities plus expected development on reported claims 427                  
Cumulative development $ (3,209)                  
Cumulative number of reported claims | claim 10,749                  
2013 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 86,119 90,502 91,460 104,982            
Total of incurred but not reported liabilities plus expected development on reported claims 16,331                  
Cumulative development $ (18,863)                  
Cumulative number of reported claims | claim 5,787                  
2013 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 92,212 91,498 88,550 91,521            
Total of incurred but not reported liabilities plus expected development on reported claims 1,142                  
Cumulative development $ 691                  
Cumulative number of reported claims | claim 6,484                  
2013 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 103,726 102,943 98,037 104,356            
Total of incurred but not reported liabilities plus expected development on reported claims 2,647                  
Cumulative development $ (630)                  
Cumulative number of reported claims | claim 15,462                  
2013 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 54,584 56,369 62,579 64,048            
Total of incurred but not reported liabilities plus expected development on reported claims 1,252                  
Cumulative development $ (9,464)                  
Cumulative number of reported claims | claim 3,949                  
2013 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 37,086 37,262 38,525 $ 39,232            
Total of incurred but not reported liabilities plus expected development on reported claims 628                  
Cumulative development $ (2,146)                  
Cumulative number of reported claims | claim 9,213                  
2014 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 106,486 117,958 118,928              
Total of incurred but not reported liabilities plus expected development on reported claims 26,590                  
Cumulative development $ (12,442)                  
Cumulative number of reported claims | claim 5,769                  
2014 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 128,762 131,198 126,216              
Total of incurred but not reported liabilities plus expected development on reported claims 2,178                  
Cumulative development $ 2,546                  
Cumulative number of reported claims | claim 7,650                  
2014 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 113,720 106,076 107,723              
Total of incurred but not reported liabilities plus expected development on reported claims 6,443                  
Cumulative development $ 5,997                  
Cumulative number of reported claims | claim 17,045                  
2014 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 58,284 60,729 64,051              
Total of incurred but not reported liabilities plus expected development on reported claims 1,921                  
Cumulative development $ (5,767)                  
Cumulative number of reported claims | claim 4,105                  
2014 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 52,944 52,661 $ 53,910              
Total of incurred but not reported liabilities plus expected development on reported claims 796                  
Cumulative development $ (966)                  
Cumulative number of reported claims | claim 10,843                  
2015 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 125,307 137,386                
Total of incurred but not reported liabilities plus expected development on reported claims 43,435                  
Cumulative development $ (12,079)                  
Cumulative number of reported claims | claim 6,309                  
2015 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 108,293 103,177                
Total of incurred but not reported liabilities plus expected development on reported claims 3,577                  
Cumulative development $ 5,116                  
Cumulative number of reported claims | claim 6,976                  
2015 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 129,816 125,506                
Total of incurred but not reported liabilities plus expected development on reported claims 15,837                  
Cumulative development $ 4,310                  
Cumulative number of reported claims | claim 19,302                  
2015 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 55,578 53,788                
Total of incurred but not reported liabilities plus expected development on reported claims 2,818                  
Cumulative development $ 1,790                  
Cumulative number of reported claims | claim 4,366                  
2015 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 41,088 $ 42,848                
Total of incurred but not reported liabilities plus expected development on reported claims 989                  
Cumulative development $ (1,760)                  
Cumulative number of reported claims | claim 9,313                  
2016 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 139,144                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 71,618                  
Cumulative number of reported claims | claim 5,279                  
2016 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 147,473                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 14,476                  
Cumulative number of reported claims | claim 7,142                  
2016 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 174,018                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 47,509                  
Cumulative number of reported claims | claim 22,910                  
2016 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 70,419                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 10,858                  
Cumulative number of reported claims | claim 3,847                  
2016 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 48,072                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 3,928                  
Cumulative number of reported claims | claim 10,291