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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, 2019
USD ($)
claim
Dec. 31, 2018
USD ($)
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 ($)
Dec. 31, 2010
USD ($)
Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 1,191,073                  
Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 1,256,148                  
Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 1,553,107                  
Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 495,519                  
Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 469,431                  
2010 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 79,263 $ 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 10,987                  
Cumulative development $ (9,724)                  
Cumulative number of reported claims | claim 5,359                  
2010 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 84,251 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 100                  
Cumulative development $ (28,888)                  
Cumulative number of reported claims | claim 16,696                  
2010 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 67,878 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 2                  
Cumulative development $ (7,903)                  
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 $ 42,877 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 287                  
Cumulative development $ 4,667                  
Cumulative number of reported claims | claim 3,989                  
2010 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 33,189 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 2                  
Cumulative development $ (3,497)                  
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 $ 81,694 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 12,092                  
Cumulative development $ 172                  
Cumulative number of reported claims | claim 5,551                  
2011 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 121,749 121,319 121,434 120,219 119,820 120,492 117,082 142,330 148,220  
Total of incurred but not reported liabilities plus expected development on reported claims 261                  
Cumulative development $ (26,471)                  
Cumulative number of reported claims | claim 16,066                  
2011 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 90,643 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 16                  
Cumulative development $ 5,756                  
Cumulative number of reported claims | claim 15,253                  
2011 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 32,384 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 291                  
Cumulative development $ (7,583)                  
Cumulative number of reported claims | claim 3,960                  
2011 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 46,752 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 0                  
Cumulative development $ (3,262)                  
Cumulative number of reported claims | claim 14,848                  
2012 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 91,571 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 14,677                  
Cumulative development $ (8,818)                  
Cumulative number of reported claims | claim 5,742                  
2012 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 109,480 109,687 108,623 107,958 108,047 108,774 110,448 138,602    
Total of incurred but not reported liabilities plus expected development on reported claims 495                  
Cumulative development $ (29,122)                  
Cumulative number of reported claims | claim 6,457                  
2012 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 96,059 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 143                  
Cumulative development $ (3,980)                  
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 $ 39,063 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 300                  
Cumulative development $ (9,785)                  
Cumulative number of reported claims | claim 3,987                  
2012 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 44,158 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 1                  
Cumulative development $ (3,766)                  
Cumulative number of reported claims | claim 10,784                  
2013 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 86,082 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 6,199                  
Cumulative development $ (18,900)                  
Cumulative number of reported claims | claim 6,280                  
2013 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 92,988 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 139                  
Cumulative development $ 1,467                  
Cumulative number of reported claims | claim 6,650                  
2013 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 104,886 105,248 104,980 103,726 102,943 98,037 104,356      
Total of incurred but not reported liabilities plus expected development on reported claims 448                  
Cumulative development $ 530                  
Cumulative number of reported claims | claim 15,523                  
2013 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 50,984 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 401                  
Cumulative development $ (13,064)                  
Cumulative number of reported claims | claim 4,249                  
2013 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 36,486 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 7                  
Cumulative development $ (2,746)                  
Cumulative number of reported claims | claim 9,247                  
2014 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 105,507 102,487 97,809 106,486 117,958 118,928        
Total of incurred but not reported liabilities plus expected development on reported claims 6,080                  
Cumulative development $ (13,421)                  
Cumulative number of reported claims | claim 6,458                  
2014 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 126,811 128,503 128,185 128,762 131,198 126,216        
Total of incurred but not reported liabilities plus expected development on reported claims 141                  
Cumulative development $ 595                  
Cumulative number of reported claims | claim 7,919                  
2014 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 121,077 120,385 118,869 113,720 106,076 107,723        
Total of incurred but not reported liabilities plus expected development on reported claims 1,013                  
Cumulative development $ 13,354                  
Cumulative number of reported claims | claim 17,318                  
2014 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 53,023 54,636 56,630 58,284 60,729 64,051        
Total of incurred but not reported liabilities plus expected development on reported claims 699                  
Cumulative development $ (11,028)                  
Cumulative number of reported claims | claim 4,741                  
2014 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 52,702 52,615 52,782 52,944 52,661 $ 53,910        
Total of incurred but not reported liabilities plus expected development on reported claims 24                  
Cumulative development $ (1,208)                  
Cumulative number of reported claims | claim 10,951                  
2015 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 129,945 127,091 120,005 125,307 137,386          
Total of incurred but not reported liabilities plus expected development on reported claims 15,253                  
Cumulative development $ (7,441)                  
Cumulative number of reported claims | claim 7,594                  
2015 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 105,218 108,235 110,633 108,293 103,177          
Total of incurred but not reported liabilities plus expected development on reported claims 237                  
Cumulative development $ 2,041                  
Cumulative number of reported claims | claim 7,553                  
2015 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 137,395 138,987 132,206 129,816 125,506          
Total of incurred but not reported liabilities plus expected development on reported claims 1,265                  
Cumulative development $ 11,889                  
Cumulative number of reported claims | claim 20,054                  
2015 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 46,019 46,682 51,003 55,578 53,788          
Total of incurred but not reported liabilities plus expected development on reported claims 692                  
Cumulative development $ (7,769)                  
Cumulative number of reported claims | claim 5,600                  
2015 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 40,220 40,368 40,336 41,088 $ 42,848          
Total of incurred but not reported liabilities plus expected development on reported claims 79                  
Cumulative development $ (2,628)                  
Cumulative number of reported claims | claim 9,545                  
2016 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 142,397 136,275 130,041 139,144            
Total of incurred but not reported liabilities plus expected development on reported claims 22,149                  
Cumulative development $ 3,253                  
Cumulative number of reported claims | claim 8,635                  
2016 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 143,724 143,721 144,208 147,473            
Total of incurred but not reported liabilities plus expected development on reported claims 927                  
Cumulative development $ (3,749)                  
Cumulative number of reported claims | claim 9,794                  
2016 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 175,657 174,337 175,357 174,018            
Total of incurred but not reported liabilities plus expected development on reported claims 4,583                  
Cumulative development $ 1,639                  
Cumulative number of reported claims | claim 27,181                  
2016 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 55,168 61,648 66,575 70,419            
Total of incurred but not reported liabilities plus expected development on reported claims 989                  
Cumulative development $ (15,251)                  
Cumulative number of reported claims | claim 7,791                  
2016 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 45,961 45,379 45,840 $ 48,072            
Total of incurred but not reported liabilities plus expected development on reported claims 212                  
Cumulative development $ (2,111)                  
Cumulative number of reported claims | claim 11,877                  
2017 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 152,547 139,032 139,602              
Total of incurred but not reported liabilities plus expected development on reported claims 33,205                  
Cumulative development $ 12,945                  
Cumulative number of reported claims | claim 8,541                  
2017 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 160,946 160,240 155,139              
Total of incurred but not reported liabilities plus expected development on reported claims 2,374                  
Cumulative development $ 5,807                  
Cumulative number of reported claims | claim 13,338                  
2017 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 235,110 224,553 227,919              
Total of incurred but not reported liabilities plus expected development on reported claims 13,547                  
Cumulative development $ 7,191                  
Cumulative number of reported claims | claim 32,693                  
2017 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 55,982 69,528 76,184              
Total of incurred but not reported liabilities plus expected development on reported claims 1,921                  
Cumulative development $ (20,202)                  
Cumulative number of reported claims | claim 7,963                  
2017 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 58,695 59,342 $ 60,330              
Total of incurred but not reported liabilities plus expected development on reported claims 410                  
Cumulative development $ (1,635)                  
Cumulative number of reported claims | claim 14,639                  
2018 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 172,894 163,059                
Total of incurred but not reported liabilities plus expected development on reported claims 46,781                  
Cumulative development $ 9,835                  
Cumulative number of reported claims | claim 7,921                  
2018 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 146,951 143,280                
Total of incurred but not reported liabilities plus expected development on reported claims 4,581                  
Cumulative development $ 3,671                  
Cumulative number of reported claims | claim 10,489                  
2018 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 245,173 236,629                
Total of incurred but not reported liabilities plus expected development on reported claims 29,941                  
Cumulative development $ 8,544                  
Cumulative number of reported claims | claim 33,922                  
2018 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 67,883 71,972                
Total of incurred but not reported liabilities plus expected development on reported claims 3,364                  
Cumulative development $ (4,089)                  
Cumulative number of reported claims | claim 7,430                  
2018 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 51,721 $ 51,639                
Total of incurred but not reported liabilities plus expected development on reported claims 621                  
Cumulative development $ 82                  
Cumulative number of reported claims | claim 13,502                  
2019 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 149,173                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 71,236                  
Cumulative number of reported claims | claim 5,813                  
2019 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 164,030                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 22,125                  
Cumulative number of reported claims | claim 9,967                  
2019 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 279,229                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 78,104                  
Cumulative number of reported claims | claim 30,946                  
2019 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 52,136                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 5,283                  
Cumulative number of reported claims | claim 5,059                  
2019 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 59,547                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 6,034                  
Cumulative number of reported claims | claim 12,007