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Liability for Unpaid Losses and Loss Adjustment Expense Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
claim
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 115,917                  
Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 111,887                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 6,597                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 105,332                  
Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 947,221                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 109,320                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 838,077                  
Short-duration Insurance Contracts, Accident Year 2006 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 42                  
Short-duration Insurance Contracts, Accident Year 2006 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 176                  
Short-duration Insurance Contracts, Accident Year 2007 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 7,507 $ 7,464 $ 7,464 $ 7,504 $ 7,554 $ 7,553 $ 7,825 $ 8,313 $ 9,605 $ 11,491
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 1,191,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 7,507 7,452 7,449 7,442 7,303 7,127 7,001 6,627 5,885 3,974
Short-duration Insurance Contracts, Accident Year 2007 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 24,601 24,596 24,725 24,665 24,563 24,641 24,852 24,828 25,780 28,232
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 2,332,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 24,601 24,596 24,483 24,439 24,382 24,277 24,155 23,131 22,017 $ 16,713
Short-duration Insurance Contracts, Accident Year 2008 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 12,884 12,885 12,761 12,661 11,877 11,833 12,324 12,871 13,504  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 1,170,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 12,884 12,557 12,403 12,360 11,404 11,104 10,647 9,309 6,169  
Short-duration Insurance Contracts, Accident Year 2008 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 27,453 27,468 27,564 27,597 27,358 27,161 27,174 28,126 30,073  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 3,170,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 27,451 27,445 27,390 27,358 27,044 26,360 25,264 23,806 $ 17,915  
Short-duration Insurance Contracts, Accident Year 2009 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 10,009 9,837 9,844 9,902 10,026 10,093 10,135 10,610    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 1,097,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 10,009 9,688 9,570 9,471 9,062 8,470 7,507 4,807    
Short-duration Insurance Contracts, Accident Year 2009 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 44,996 44,959 45,116 45,316 45,583 45,515 46,089 46,952    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 4,044,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 44,966 44,898 44,737 44,413 44,114 43,149 41,134 $ 31,525    
Short-duration Insurance Contracts, Accident Year 2010 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 11,072 11,105 11,020 11,126 10,733 11,042 9,911      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 1,160,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 11,073 10,327 10,242 10,182 9,036 8,128 4,346      
Short-duration Insurance Contracts, Accident Year 2010 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 51,674 51,841 51,685 52,239 51,862 51,292 51,144      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 4,839,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 51,163 50,704 50,215 49,256 46,711 43,932 $ 32,993      
Short-duration Insurance Contracts, Accident Year 2011 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 10,740 10,575 10,630 10,896 11,022 11,126        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 1,217,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 10,740 10,128 9,837 9,444 8,013 4,587        
Short-duration Insurance Contracts, Accident Year 2011 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 60,215 59,517 58,047 57,670 56,840 53,878        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 62                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 5,913,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 59,461 58,069 55,532 52,412 48,558 $ 36,419        
Short-duration Insurance Contracts, Accident Year 2012 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 9,147 9,412 9,350 9,651 10,760          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 11                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 1,061,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 9,124 8,626 8,242 7,631 5,112          
Short-duration Insurance Contracts, Accident Year 2012 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 69,000 68,388 68,923 69,438 65,112          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 167                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 10,649,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 68,337 66,739 64,675 60,640 $ 42,699          
Short-duration Insurance Contracts, Accident Year 2013 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 5,736 5,401 5,817 6,657            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 5                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 553,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 5,566 4,811 4,496 2,925            
Short-duration Insurance Contracts, Accident Year 2013 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 92,702 93,041 94,755 98,461            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 677                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 7,809,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 90,627 89,068 85,346 $ 63,732            
Short-duration Insurance Contracts, Accident Year 2014 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 8,016 7,927 9,073              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 76                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 682,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 7,868 6,237 4,008              
Short-duration Insurance Contracts, Accident Year 2014 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 131,402 130,488 130,090              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2,025                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 10,857,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 125,951 119,612 $ 88,375              
Short-duration Insurance Contracts, Accident Year 2015 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 19,723 19,669                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 581                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 1,384,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 18,129 11,104                
Short-duration Insurance Contracts, Accident Year 2015 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 195,902 181,609                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 6,784                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 17,918,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 174,993 $ 123,888                
Short-duration Insurance Contracts, Accident Year 2016 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 17,053                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,952                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 46,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 12,432                  
Short-duration Insurance Contracts, Accident Year 2016 | Homeowners' Insurance Product                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 249,276                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 34,483                  
Short-duration Insurance Contracts, Number of Reported Claims | claim 28,430,000                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 170,527