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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, 2017
USD ($)
claim
Dec. 31, 2016
USD ($)
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 ($)
Dec. 31, 2008
USD ($)
Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 986,070                  
Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 1,153,596                  
Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 1,151,392                  
Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 491,813                  
Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 435,063                  
2008 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 75,364 $ 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 12,636                  
Cumulative development $ (4,091)                  
Cumulative number of reported claims | claim 6,734                  
2008 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 118,308 118,329 118,376 118,115 116,940 134,821 140,321 138,602 141,384 157,303
Total of incurred but not reported liabilities plus expected development on reported claims 44                  
Cumulative development $ (38,995)                  
Cumulative number of reported claims | claim 21,101                  
2008 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 73,487 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 12                  
Cumulative development $ (6,974)                  
Cumulative number of reported claims | claim 18,114                  
2008 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 38,664 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 499                  
Cumulative development $ (4,075)                  
Cumulative number of reported claims | claim 5,057                  
2008 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 42,881 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 0                  
Cumulative development $ (7,080)                  
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 $ 86,543 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 11,268                  
Cumulative development $ (1,755)                  
Cumulative number of reported claims | claim 6,123                  
2009 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 89,027 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 154                  
Cumulative development $ (24,727)                  
Cumulative number of reported claims | claim 18,038                  
2009 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 63,509 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 0                  
Cumulative development $ (16,512)                  
Cumulative number of reported claims | claim 15,019                  
2009 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 35,012 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 489                  
Cumulative development $ (8,548)                  
Cumulative number of reported claims | claim 4,264                  
2009 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 31,867 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 2                  
Cumulative development $ (2,730)                  
Cumulative number of reported claims | claim 13,502                  
2010 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 78,498 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 14,468                  
Cumulative development $ (10,489)                  
Cumulative number of reported claims | claim 5,174                  
2010 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 84,213 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 229                  
Cumulative development $ (28,926)                  
Cumulative number of reported claims | claim 16,671                  
2010 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 67,910 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 17                  
Cumulative development $ (7,871)                  
Cumulative number of reported claims | claim 16,245                  
2010 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 42,617 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 596                  
Cumulative development $ 4,407                  
Cumulative number of reported claims | claim 3,978                  
2010 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 33,213 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 29                  
Cumulative development $ (3,473)                  
Cumulative number of reported claims | claim 13,325                  
2011 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 81,463 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 15,016                  
Cumulative development $ (59)                  
Cumulative number of reported claims | claim 5,328                  
2011 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 121,434 120,219 119,820 120,492 117,082 142,330 148,220      
Total of incurred but not reported liabilities plus expected development on reported claims 611                  
Cumulative development $ (26,786)                  
Cumulative number of reported claims | claim 16,026                  
2011 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 90,766 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 311                  
Cumulative development $ 5,879                  
Cumulative number of reported claims | claim 15,246                  
2011 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 33,352 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 747                  
Cumulative development $ (6,615)                  
Cumulative number of reported claims | claim 3,930                  
2011 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 46,733 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 74                  
Cumulative development $ (3,281)                  
Cumulative number of reported claims | claim 14,843                  
2012 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 91,346 92,537 91,980 94,195 96,158 100,389        
Total of incurred but not reported liabilities plus expected development on reported claims 18,407                  
Cumulative development $ (9,043)                  
Cumulative number of reported claims | claim 5,540                  
2012 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 108,623 107,958 108,047 108,774 110,448 138,602        
Total of incurred but not reported liabilities plus expected development on reported claims 970                  
Cumulative development $ (29,979)                  
Cumulative number of reported claims | claim 6,408                  
2012 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 96,389 96,594 95,321 94,755 90,848 100,039        
Total of incurred but not reported liabilities plus expected development on reported claims 488                  
Cumulative development $ (3,650)                  
Cumulative number of reported claims | claim 14,353                  
2012 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 39,015 38,553 38,423 42,158 46,279 48,848        
Total of incurred but not reported liabilities plus expected development on reported claims 754                  
Cumulative development $ (9,833)                  
Cumulative number of reported claims | claim 3,813                  
2012 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 44,352 44,715 46,150 46,403 46,199 $ 47,924        
Total of incurred but not reported liabilities plus expected development on reported claims 108                  
Cumulative development $ (3,572)                  
Cumulative number of reported claims | claim 10,769                  
2013 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 85,399 86,119 90,502 91,460 104,982          
Total of incurred but not reported liabilities plus expected development on reported claims 9,697                  
Cumulative development $ (19,583)                  
Cumulative number of reported claims | claim 6,007                  
2013 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 93,826 92,212 91,498 88,550 91,521          
Total of incurred but not reported liabilities plus expected development on reported claims 1,139                  
Cumulative development $ 2,305                  
Cumulative number of reported claims | claim 6,598                  
2013 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 104,980 103,726 102,943 98,037 104,356          
Total of incurred but not reported liabilities plus expected development on reported claims 1,310                  
Cumulative development $ 624                  
Cumulative number of reported claims | claim 15,504                  
2013 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 52,761 54,584 56,369 62,579 64,048          
Total of incurred but not reported liabilities plus expected development on reported claims 975                  
Cumulative development $ (11,287)                  
Cumulative number of reported claims | claim 4,173                  
2013 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 36,729 37,086 37,262 38,525 $ 39,232          
Total of incurred but not reported liabilities plus expected development on reported claims 172                  
Cumulative development $ (2,503)                  
Cumulative number of reported claims | claim 9,232                  
2014 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 97,809 106,486 117,958 118,928            
Total of incurred but not reported liabilities plus expected development on reported claims 13,583                  
Cumulative development $ (21,119)                  
Cumulative number of reported claims | claim 6,109                  
2014 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 128,185 128,762 131,198 126,216            
Total of incurred but not reported liabilities plus expected development on reported claims 1,397                  
Cumulative development $ 1,969                  
Cumulative number of reported claims | claim 7,827                  
2014 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 118,869 113,720 106,076 107,723            
Total of incurred but not reported liabilities plus expected development on reported claims 3,634                  
Cumulative development $ 11,146                  
Cumulative number of reported claims | claim 17,222                  
2014 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 56,630 58,284 60,729 64,051            
Total of incurred but not reported liabilities plus expected development on reported claims 1,409                  
Cumulative development $ (7,421)                  
Cumulative number of reported claims | claim 4,593                  
2014 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 52,782 52,944 52,661 $ 53,910            
Total of incurred but not reported liabilities plus expected development on reported claims 236                  
Cumulative development $ (1,128)                  
Cumulative number of reported claims | claim 10,899                  
2015 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 120,005 125,307 137,386              
Total of incurred but not reported liabilities plus expected development on reported claims 25,634                  
Cumulative development $ (17,381)                  
Cumulative number of reported claims | claim 7,083                  
2015 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 110,633 108,293 103,177              
Total of incurred but not reported liabilities plus expected development on reported claims 3,370                  
Cumulative development $ 7,456                  
Cumulative number of reported claims | claim 7,465                  
2015 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 132,206 129,816 125,506              
Total of incurred but not reported liabilities plus expected development on reported claims 7,874                  
Cumulative development $ 6,700                  
Cumulative number of reported claims | claim 19,875                  
2015 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 51,003 55,578 53,788              
Total of incurred but not reported liabilities plus expected development on reported claims 1,753                  
Cumulative development $ (2,785)                  
Cumulative number of reported claims | claim 5,311                  
2015 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 40,336 41,088 $ 42,848              
Total of incurred but not reported liabilities plus expected development on reported claims 396                  
Cumulative development $ (2,512)                  
Cumulative number of reported claims | claim 9,490                  
2016 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 130,041 139,144                
Total of incurred but not reported liabilities plus expected development on reported claims 35,760                  
Cumulative development $ (9,103)                  
Cumulative number of reported claims | claim 7,512                  
2016 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 144,208 147,473                
Total of incurred but not reported liabilities plus expected development on reported claims 3,597                  
Cumulative development $ (3,265)                  
Cumulative number of reported claims | claim 9,496                  
2016 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 175,357 174,018                
Total of incurred but not reported liabilities plus expected development on reported claims 21,439                  
Cumulative development $ 1,339                  
Cumulative number of reported claims | claim 26,662                  
2016 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 66,575 70,419                
Total of incurred but not reported liabilities plus expected development on reported claims 3,392                  
Cumulative development $ (3,844)                  
Cumulative number of reported claims | claim 6,732                  
2016 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 45,840 $ 48,072                
Total of incurred but not reported liabilities plus expected development on reported claims 733                  
Cumulative development $ (2,232)                  
Cumulative number of reported claims | claim 11,674                  
2017 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 139,602                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 68,465                  
Cumulative number of reported claims | claim 5,833                  
2017 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 155,139                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 16,178                  
Cumulative number of reported claims | claim 11,574                  
2017 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 227,919                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 58,850                  
Cumulative number of reported claims | claim 28,858                  
2017 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 76,184                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 7,317                  
Cumulative number of reported claims | claim 5,460                  
2017 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 60,330                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 3,310                  
Cumulative number of reported claims | claim 13,049