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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, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
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 ($)
Dec. 31, 2009
USD ($)
Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 1,089,361                  
Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 1,181,614                  
Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 1,318,681                  
Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 505,557                  
Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 442,013                  
2009 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 85,576 $ 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 9,249                  
Cumulative development $ (2,722)                  
Cumulative number of reported claims | claim 6,333                  
2009 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 88,648 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 80                  
Cumulative development $ (25,106)                  
Cumulative number of reported claims | claim 18,053                  
2009 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 63,506 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 $ (16,515)                  
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 $ 34,783 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 193                  
Cumulative development $ (8,777)                  
Cumulative number of reported claims | claim 4,265                  
2009 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 31,879 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 $ (2,718)                  
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 $ 76,956 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 11,859                  
Cumulative development $ (12,031)                  
Cumulative number of reported claims | claim 5,264                  
2010 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 84,123 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 65                  
Cumulative development $ (29,016)                  
Cumulative number of reported claims | claim 16,690                  
2010 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 67,893 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 5                  
Cumulative development $ (7,888)                  
Cumulative number of reported claims | claim 16,246                  
2010 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 42,666 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 346                  
Cumulative development $ 4,456                  
Cumulative number of reported claims | claim 3,986                  
2010 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 33,204 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 14                  
Cumulative development $ (3,482)                  
Cumulative number of reported claims | claim 13,330                  
2011 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 80,338 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 12,231                  
Cumulative development $ (1,184)                  
Cumulative number of reported claims | claim 5,436                  
2011 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 121,319 121,434 120,219 119,820 120,492 117,082 142,330 148,220    
Total of incurred but not reported liabilities plus expected development on reported claims 281                  
Cumulative development $ (26,901)                  
Cumulative number of reported claims | claim 16,037                  
2011 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 90,838 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 199                  
Cumulative development $ 5,951                  
Cumulative number of reported claims | claim 15,248                  
2011 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 32,707 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 425                  
Cumulative development $ (7,260)                  
Cumulative number of reported claims | claim 3,955                  
2011 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 46,761 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 32                  
Cumulative development $ (3,253)                  
Cumulative number of reported claims | claim 14,846                  
2012 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 89,731 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 15,179                  
Cumulative development $ (10,658)                  
Cumulative number of reported claims | claim 5,631                  
2012 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 109,687 108,623 107,958 108,047 108,774 110,448 138,602      
Total of incurred but not reported liabilities plus expected development on reported claims 813                  
Cumulative development $ (28,915)                  
Cumulative number of reported claims | claim 6,438                  
2012 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 96,305 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 243                  
Cumulative development $ (3,734)                  
Cumulative number of reported claims | claim 14,364                  
2012 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 39,182 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 503                  
Cumulative development $ (9,666)                  
Cumulative number of reported claims | claim 3,982                  
2012 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 44,165 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 7                  
Cumulative development $ (3,759)                  
Cumulative number of reported claims | claim 10,776                  
2013 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 88,816 85,399 86,119 90,502 91,460 104,982        
Total of incurred but not reported liabilities plus expected development on reported claims 7,922                  
Cumulative development $ (16,166)                  
Cumulative number of reported claims | claim 6,147                  
2013 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 93,858 93,826 92,212 91,498 88,550 91,521        
Total of incurred but not reported liabilities plus expected development on reported claims 515                  
Cumulative development $ 2,337                  
Cumulative number of reported claims | claim 6,626                  
2013 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 105,248 104,980 103,726 102,943 98,037 104,356        
Total of incurred but not reported liabilities plus expected development on reported claims 811                  
Cumulative development $ 892                  
Cumulative number of reported claims | claim 15,520                  
2013 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 51,753 52,761 54,584 56,369 62,579 64,048        
Total of incurred but not reported liabilities plus expected development on reported claims 781                  
Cumulative development $ (12,295)                  
Cumulative number of reported claims | claim 4,236                  
2013 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 36,661 36,729 37,086 37,262 38,525 $ 39,232        
Total of incurred but not reported liabilities plus expected development on reported claims 36                  
Cumulative development $ (2,571)                  
Cumulative number of reported claims | claim 9,240                  
2014 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 102,487 97,809 106,486 117,958 118,928          
Total of incurred but not reported liabilities plus expected development on reported claims 10,092                  
Cumulative development $ (16,441)                  
Cumulative number of reported claims | claim 6,289                  
2014 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 128,503 128,185 128,762 131,198 126,216          
Total of incurred but not reported liabilities plus expected development on reported claims 1,012                  
Cumulative development $ 2,287                  
Cumulative number of reported claims | claim 7,883                  
2014 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 120,385 118,869 113,720 106,076 107,723          
Total of incurred but not reported liabilities plus expected development on reported claims 1,706                  
Cumulative development $ 12,662                  
Cumulative number of reported claims | claim 17,277                  
2014 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 54,636 56,630 58,284 60,729 64,051          
Total of incurred but not reported liabilities plus expected development on reported claims 1,106                  
Cumulative development $ (9,415)                  
Cumulative number of reported claims | claim 4,668                  
2014 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 52,615 52,782 52,944 52,661 $ 53,910          
Total of incurred but not reported liabilities plus expected development on reported claims 76                  
Cumulative development $ (1,295)                  
Cumulative number of reported claims | claim 10,929                  
2015 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 127,091 120,005 125,307 137,386            
Total of incurred but not reported liabilities plus expected development on reported claims 19,976                  
Cumulative development $ (10,295)                  
Cumulative number of reported claims | claim 7,385                  
2015 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 108,235 110,633 108,293 103,177            
Total of incurred but not reported liabilities plus expected development on reported claims 1,633                  
Cumulative development $ 5,058                  
Cumulative number of reported claims | claim 7,523                  
2015 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 138,987 132,206 129,816 125,506            
Total of incurred but not reported liabilities plus expected development on reported claims 3,837                  
Cumulative development $ 13,481                  
Cumulative number of reported claims | claim 19,961                  
2015 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 46,682 51,003 55,578 53,788            
Total of incurred but not reported liabilities plus expected development on reported claims 935                  
Cumulative development $ (7,106)                  
Cumulative number of reported claims | claim 5,515                  
2015 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 40,368 40,336 41,088 $ 42,848            
Total of incurred but not reported liabilities plus expected development on reported claims 132                  
Cumulative development $ (2,480)                  
Cumulative number of reported claims | claim 9,522                  
2016 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 136,275 130,041 139,144              
Total of incurred but not reported liabilities plus expected development on reported claims 26,097                  
Cumulative development $ (2,869)                  
Cumulative number of reported claims | claim 8,217                  
2016 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 143,721 144,208 147,473              
Total of incurred but not reported liabilities plus expected development on reported claims 2,320                  
Cumulative development $ (3,752)                  
Cumulative number of reported claims | claim 9,703                  
2016 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 174,337 175,357 174,018              
Total of incurred but not reported liabilities plus expected development on reported claims 10,723                  
Cumulative development $ 319                  
Cumulative number of reported claims | claim 27,040                  
2016 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 61,648 66,575 70,419              
Total of incurred but not reported liabilities plus expected development on reported claims 2,042                  
Cumulative development $ (8,771)                  
Cumulative number of reported claims | claim 7,376                  
2016 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 45,379 45,840 $ 48,072              
Total of incurred but not reported liabilities plus expected development on reported claims 351                  
Cumulative development $ (2,693)                  
Cumulative number of reported claims | claim 11,840                  
2017 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 139,032 139,602                
Total of incurred but not reported liabilities plus expected development on reported claims 38,919                  
Cumulative development $ (570)                  
Cumulative number of reported claims | claim 7,837                  
2017 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 160,240 155,139                
Total of incurred but not reported liabilities plus expected development on reported claims 4,553                  
Cumulative development $ 5,101                  
Cumulative number of reported claims | claim 13,021                  
2017 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 224,553 227,919                
Total of incurred but not reported liabilities plus expected development on reported claims 28,591                  
Cumulative development $ (3,366)                  
Cumulative number of reported claims | claim 32,281                  
2017 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 69,528 76,184                
Total of incurred but not reported liabilities plus expected development on reported claims 3,744                  
Cumulative development $ (6,656)                  
Cumulative number of reported claims | claim 7,283                  
2017 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 59,342 $ 60,330                
Total of incurred but not reported liabilities plus expected development on reported claims 733                  
Cumulative development $ (988)                  
Cumulative number of reported claims | claim 14,454                  
2018 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 163,059                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 78,705                  
Cumulative number of reported claims | claim 6,088                  
2018 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 143,280                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 13,286                  
Cumulative number of reported claims | claim 9,235                  
2018 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 236,629                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 65,079                  
Cumulative number of reported claims | claim 30,521                  
2018 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 71,972                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 5,885                  
Cumulative number of reported claims | claim 5,478                  
2018 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 51,639                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 3,027                  
Cumulative number of reported claims | claim 12,246