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Property and Casualty Unpaid Claims and Claim Expenses (Details 2)
Dec. 31, 2016
USD ($)
Number
Dec. 31, 2015
USD ($)
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 ($)
Dec. 31, 2007
USD ($)
Homeowners [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net $ 1,165,428,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,133,132,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 18,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 23,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 32,314,000                  
Homeowners [Member] | Short-duration Insurance Contracts, Accident Year 2007 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 83,111,000 $ 83,101,000 $ 83,090,000 $ 83,241,000 $ 83,266,000 $ 83,198,000 $ 85,605,000 $ 84,666,000 $ 85,725,000 $ 85,552,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 19,298                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 83,096,000 83,096,000 83,028,000 83,028,000 82,977,000 82,722,000 82,862,000 82,272,000 79,566,000 59,268,000
Homeowners [Member] | Short-duration Insurance Contracts, Accident Year 2008 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 139,306,000 139,348,000 139,472,000 139,511,000 139,232,000 139,743,000 136,002,000 136,743,000 140,469,000  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 31,376                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 139,256,000 139,224,000 139,121,000 138,992,000 138,802,000 136,923,000 134,235,000 130,888,000 105,401,000  
Homeowners [Member] | Short-duration Insurance Contracts, Accident Year 2009 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 112,900,000 113,216,000 113,230,000 113,357,000 113,096,000 112,970,000 112,280,000 113,274,000    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 22,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 20,320                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 112,848,000 112,827,000 112,720,000 112,554,000 110,324,000 108,217,000 104,407,000 81,570,000    
Homeowners [Member] | Short-duration Insurance Contracts, Accident Year 2010 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 132,859,000 133,136,000 133,216,000 133,235,000 133,358,000 136,907,000 140,994,000      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 235,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 23,624                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 132,599,000 132,604,000 132,523,000 132,246 129,790,000 124,326,000 98,190,000      
Homeowners [Member] | Short-duration Insurance Contracts, Accident Year 2011 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 148,414,000 148,755,000 148,860,000 150,791,000 150,334,000 150,141,000        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 358,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 27,676                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 148,026,000 147,451,000 146,908,000 145,852,000 142,846,000 123,046,000        
Homeowners [Member] | Short-duration Insurance Contracts, Accident Year 2012 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 106,309,000 106,486,000 109,360,000 109,156,000 108,754,000          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 502,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 20,239                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 105,561,000 105,156,000 104,203,000 101,566,000 84,260,000          
Homeowners [Member] | Short-duration Insurance Contracts, Accident Year 2013 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 102,406,000 103,982,000 107,489,000 105,584,000            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,023,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 18,066                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 100,968,000 99,361,000 96,599,000 76,890,000            
Homeowners [Member] | Short-duration Insurance Contracts, Accident Year 2014 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 109,058,000 113,506,000 111,647,000              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3,136,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 18,400                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 105,703,000 103,030,000 83,314,000              
Homeowners [Member] | Short-duration Insurance Contracts, Accident Year 2015 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 115,134,000 111,706,000                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 4,480,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 17,054                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 109,303,000 90,704,000                
Homeowners [Member] | Short-duration Insurance Contracts, Accident Year 2016 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 115,931,000                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 11,737,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 15,578                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 95,772,000                  
Auto Liability [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,524,935,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,342,855,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 80,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 451,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 182,162,000                  
Auto Liability [Member] | Short-duration Insurance Contracts, Accident Year 2007 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 136,826,000 136,745,000 136,855,000 136,817,000 137,151,000 138,148,000 139,619,000 144,661,000 146,400,000 148,884,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 49,856                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 136,815,000 136,630,000 136,504,000 136,056,000 135,467,000 134,207,000 130,555,000 122,129,000 101,803,000 56,819,000
Auto Liability [Member] | Short-duration Insurance Contracts, Accident Year 2008 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 138,975,000 139,131,000 139,938,000 140,648,000 141,666,000 149,225,000 142,279,000 145,669,000 144,694,000  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 47,932                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 138,962,000 138,875,000 138,758,000 138,539,000 137,980,000 134,377,000 123,062,000 103,370,000 54,750,000  
Auto Liability [Member] | Short-duration Insurance Contracts, Accident Year 2009 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 149,822,000 150,568,000 150,919,000 151,418,000 157,941,000 153,662,000 158,703,000 159,934,000    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 48,780                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 149,801,000 149,608,000 148,783,000 146,383,000 142,524,000 133,568,000 110,921,000 60,011,000    
Auto Liability [Member] | Short-duration Insurance Contracts, Accident Year 2010 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 149,818,000 151,653,000 152,483,000 154,222,000 156,369,000 160,058,000 157,712,000      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 324,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 49,310                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 149,247,000 148,751,000 147,337,000 144,255,000 137,012,000 118,345,000 63,416,000      
Auto Liability [Member] | Short-duration Insurance Contracts, Accident Year 2011 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 139,840,000 142,488,000 143,133,000 145,735,000 146,713,000 150,803,000        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,164,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 46,171                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 138,151,000 136,906,000 133,931,000 126,812,000 108,837,000 61,070,000        
Auto Liability [Member] | Short-duration Insurance Contracts, Accident Year 2012 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 147,594,000 149,347,000 150,336,000 153,815,000 156,448,000          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2,849                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 45,615                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 142,916,000 138,641,000 127,185,000 109,574,000 61,279,000          
Auto Liability [Member] | Short-duration Insurance Contracts, Accident Year 2013 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 150,657,000 150,720,000 152,858,000 153,860,000            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 6,501,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 46,195                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 139,954,000 131,215,000 108,856,000 62,224,000            
Auto Liability [Member] | Short-duration Insurance Contracts, Accident Year 2014 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 158,470,000 157,249,000 155,105,000              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 8,493,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 47,146                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 139,463,000 117,468,000 61,329,000              
Auto Liability [Member] | Short-duration Insurance Contracts, Accident Year 2015 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 172,553,000 165,515,000                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 13,074,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 47,529                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 134,473,000 70,834,000                
Auto Liability [Member] | Short-duration Insurance Contracts, Accident Year 2016 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 180,380,000                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 55,506,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 41,220                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 73,073,000                  
Auto Physical Damage [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 902,576,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 896,202,000                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 0                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 0                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 6,374,000                  
Auto Physical Damage [Member] | Short-duration Insurance Contracts, Accident Year 2007 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 86,680,000 86,683,000 86,694,000 86,706,000 86,713,000 86,695,000 85,515,000 86,178,000 86,178,000 87,051,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 70,280                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 86,680,000 86,685,000 86,694,000 86,706,000 86,713,000 86,695,000 86,637,000 86,678,000 86,439,000 $ 81,171,000
Auto Physical Damage [Member] | Short-duration Insurance Contracts, Accident Year 2008 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 87,954,000 87,966,000 87,976,000 87,979,000 87,992,000 86,900,000 87,834,000 87,854,000 89,088,000  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 72,117                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 87,954,000 87,966,000 87,976,000 87,979,000 87,992,000 87,949,000 87,905,000 87,963,000 $ 82,412,000  
Auto Physical Damage [Member] | Short-duration Insurance Contracts, Accident Year 2009 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 81,963,000 81,972,000 81,986,000 82,000,000 82,635,000 83,202,000 83,515,000 84,539,000    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 72,867                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 81,963,000 81,973,000 81,985,000 82,000,000 82,015,000 82,039,000 82,117,000 $ 78,456,000    
Auto Physical Damage [Member] | Short-duration Insurance Contracts, Accident Year 2010 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 83,036,000 83,050,000 83,052,000 83,046,000 83,103,000 83,420,000 84,112,000      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 77,343                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 83,036,000 83,051,000 83,067,000 83,087,000 83,103,000 83,120,000 $ 79,329,000      
Auto Physical Damage [Member] | Short-duration Insurance Contracts, Accident Year 2011 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 85,116,000 85,143,000 85,120,000 86,023,000 85,507,000 86,205,000        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 76,113                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 85,116,000 85,127,000 85,148,000 85,181,000 85,254,000 $ 83,227,000        
Auto Physical Damage [Member] | Short-duration Insurance Contracts, Accident Year 2012 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 83,354,000 83,431,000 83,402,000 82,337,000 83,770,000          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 7,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 72,803                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 83,347,000 83,355,000 83,372,000 83,418,000 $ 80,519,000          
Auto Physical Damage [Member] | Short-duration Insurance Contracts, Accident Year 2013 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 88,627,000 88,672,000 88,856,000 91,448,000            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 95,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 75,845                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 88,532,000 88,580,000 88,688,000 $ 85,110,000            
Auto Physical Damage [Member] | Short-duration Insurance Contracts, Accident Year 2014 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 95,422,000 95,634,000 95,572,000              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 151,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 82,467                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 95,266,000 95,444,000 $ 88,939,000              
Auto Physical Damage [Member] | Short-duration Insurance Contracts, Accident Year 2015 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 97,994,000 99,291,000                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 139,000                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 82,335                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 97,850,000 $ 92,138,000                
Auto Physical Damage [Member] | Short-duration Insurance Contracts, Accident Year 2016 [Member]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 112,430,000                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (944,000)                  
Short-duration Insurance Contracts, Number of Reported Claims | Number 77,495                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 106,458,000