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Reserves for unpaid losses and loss adjustment expenses Reserve Development (Details)
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 ($)
Claims Development                  
Liability for claims and claim adjustment expense, net $ 280,422,000                
Property [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net 25,712,000                
All outstanding liabilities before 2014, net of reinsurance 0                
Liability for claims and claim adjustment expense, net 2,942,000                
Incurred claims and claim adjustment expense, net 28,654,000                
Casualty - claims made [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net 41,148,000                
Liability for claims and claim adjustment expense, net 50,461,000                
Incurred claims and claim adjustment expense, net 91,609,000                
Casualty - occurrence [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net 136,325,000                
Liability for claims and claim adjustment expense, net 227,019,000                
Incurred claims and claim adjustment expense, net 363,344,000                
Accident Year 2010 [Member] | Casualty - claims made [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net 859,000 $ 859,000 $ 859,000 $ 859,000 $ 862,000 $ 393,000 $ 368,000 $ 79,000 $ 0
Incurred claims and claim adjustment expense, net 876,000 883,000 894,000 916,000 946,000 737,000 679,000 805,000 778,000
Total of IBNR liabilities plus expected development on reported claims $ 17,000                
Cumulative number of reported claims 14                
Accident Year 2010 [Member] | Casualty - occurrence [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 346,000 313,000 273,000 261,000 263,000 113,000 59,000 37,000 4,000
Incurred claims and claim adjustment expense, net 402,000 429,000 406,000 404,000 458,000 460,000 531,000 771,000 $ 843,000
Total of IBNR liabilities plus expected development on reported claims $ 55,000                
Cumulative number of reported claims 48                
Accident Year 2011 [Member] | Casualty - claims made [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 3,065,000 3,042,000 3,042,000 3,044,000 2,116,000 1,392,000 1,037,000 139,000  
Incurred claims and claim adjustment expense, net 3,225,000 3,261,000 3,374,000 3,560,000 3,609,000 3,646,000 3,844,000 4,246,000  
Total of IBNR liabilities plus expected development on reported claims $ 133,000                
Cumulative number of reported claims 76                
Accident Year 2011 [Member] | Casualty - occurrence [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 8,510,000 6,868,000 6,363,000 4,575,000 3,788,000 2,519,000 1,596,000 207,000  
Incurred claims and claim adjustment expense, net 9,023,000 8,375,000 8,142,000 7,613,000 7,340,000 5,757,000 5,940,000 $ 5,839,000  
Total of IBNR liabilities plus expected development on reported claims $ 446,000                
Cumulative number of reported claims 220                
Accident Year 2012 [Member] | Casualty - claims made [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 1,946,000 1,882,000 1,090,000 1,024,000 877,000 475,000 153,000    
Incurred claims and claim adjustment expense, net 2,314,000 2,477,000 2,845,000 3,102,000 4,205,000 5,749,000 7,913,000    
Total of IBNR liabilities plus expected development on reported claims $ 368,000                
Cumulative number of reported claims 138                
Accident Year 2012 [Member] | Casualty - occurrence [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 19,383,000 16,474,000 14,382,000 11,238,000 7,850,000 4,441,000 757,000    
Incurred claims and claim adjustment expense, net 22,401,000 22,001,000 20,579,000 20,401,000 18,803,000 17,436,000 $ 16,977,000    
Total of IBNR liabilities plus expected development on reported claims $ 1,753,000                
Cumulative number of reported claims 566                
Accident Year 2013 [Member] | Casualty - claims made [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 5,439,000 5,320,000 5,070,000 4,436,000 1,915,000 499,000      
Incurred claims and claim adjustment expense, net 6,463,000 7,002,000 7,917,000 9,113,000 11,639,000 15,238,000      
Total of IBNR liabilities plus expected development on reported claims $ 1,007,000                
Cumulative number of reported claims 227                
Accident Year 2013 [Member] | Casualty - occurrence [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 26,715,000 21,348,000 14,890,000 7,957,000 4,469,000 1,099,000      
Incurred claims and claim adjustment expense, net 33,248,000 31,731,000 29,039,000 28,037,000 28,771,000 $ 30,616,000      
Total of IBNR liabilities plus expected development on reported claims $ 4,594,000                
Cumulative number of reported claims 822                
Accident Year 2014 [Member] | Property [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 1,217,000 1,217,000 1,217,000 1,217,000 169,000        
Incurred claims and claim adjustment expense, net 1,217,000 1,222,000 1,240,000 1,344,000 1,561,000        
Total of IBNR liabilities plus expected development on reported claims $ 0                
Cumulative number of reported claims 28                
Accident Year 2014 [Member] | Casualty - claims made [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 8,290,000 6,384,000 5,039,000 1,865,000 435,000        
Incurred claims and claim adjustment expense, net 10,948,000 11,217,000 11,748,000 14,289,000 18,847,000        
Total of IBNR liabilities plus expected development on reported claims $ 1,963,000                
Cumulative number of reported claims 273                
Accident Year 2014 [Member] | Casualty - occurrence [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 23,771,000 17,576,000 8,489,000 3,081,000 698,000        
Incurred claims and claim adjustment expense, net 39,313,000 36,678,000 38,049,000 40,668,000 $ 47,805,000        
Total of IBNR liabilities plus expected development on reported claims $ 9,704,000                
Cumulative number of reported claims 1,122                
Accident Year 2015 [Member] | Property [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 865,000 832,000 706,000 584,000          
Incurred claims and claim adjustment expense, net 872,000 857,000 880,000 1,394,000          
Total of IBNR liabilities plus expected development on reported claims $ 7,000                
Cumulative number of reported claims 63                
Accident Year 2015 [Member] | Casualty - claims made [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 9,238,000 7,562,000 4,496,000 217,000          
Incurred claims and claim adjustment expense, net 13,583,000 14,896,000 16,777,000 18,883,000          
Total of IBNR liabilities plus expected development on reported claims $ 3,375,000                
Cumulative number of reported claims 255                
Accident Year 2015 [Member] | Casualty - occurrence [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 28,385,000 12,685,000 3,161,000 941,000          
Incurred claims and claim adjustment expense, net 52,100,000 49,122,000 51,739,000 $ 59,717,000          
Total of IBNR liabilities plus expected development on reported claims $ 17,260,000                
Cumulative number of reported claims 1,253                
Accident Year 2016 [Member] | Property [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 3,265,000 3,257,000 1,867,000            
Incurred claims and claim adjustment expense, net 3,301,000 3,392,000 4,177,000            
Total of IBNR liabilities plus expected development on reported claims $ 31,000                
Cumulative number of reported claims 286                
Accident Year 2016 [Member] | Casualty - claims made [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 6,907,000 3,015,000 1,158,000            
Incurred claims and claim adjustment expense, net 14,675,000 14,694,000 19,170,000            
Total of IBNR liabilities plus expected development on reported claims $ 5,031,000                
Cumulative number of reported claims 308                
Accident Year 2016 [Member] | Casualty - occurrence [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 17,225,000 6,015,000 1,099,000            
Incurred claims and claim adjustment expense, net 53,549,000 55,680,000 $ 61,440,000            
Total of IBNR liabilities plus expected development on reported claims $ 27,787,000                
Cumulative number of reported claims 1,143                
Accident Year 2017 [Member] | Property [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 11,233,000 9,938,000              
Incurred claims and claim adjustment expense, net 11,705,000 12,473,000              
Total of IBNR liabilities plus expected development on reported claims $ 115,000                
Cumulative number of reported claims 1,031                
Accident Year 2017 [Member] | Casualty - claims made [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 4,897,000 340,000              
Incurred claims and claim adjustment expense, net 17,096,000 18,116,000              
Total of IBNR liabilities plus expected development on reported claims $ 9,003,000                
Cumulative number of reported claims 359                
Accident Year 2017 [Member] | Casualty - occurrence [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 9,352,000 1,581,000              
Incurred claims and claim adjustment expense, net 67,151,000 $ 71,126,000              
Total of IBNR liabilities plus expected development on reported claims $ 47,150,000                
Cumulative number of reported claims 1,116                
Accident Year 2018 [Member] | Property [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 9,132,000                
Incurred claims and claim adjustment expense, net 11,559,000                
Total of IBNR liabilities plus expected development on reported claims $ 818,000                
Cumulative number of reported claims 611                
Accident Year 2018 [Member] | Casualty - claims made [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 507,000                
Incurred claims and claim adjustment expense, net 22,429,000                
Total of IBNR liabilities plus expected development on reported claims $ 19,175,000                
Cumulative number of reported claims 432                
Accident Year 2018 [Member] | Casualty - occurrence [Member]                  
Claims Development                  
Cumulative paid claims and allocated claim adjustment expense, net $ 2,638,000                
Incurred claims and claim adjustment expense, net 86,157,000                
Total of IBNR liabilities plus expected development on reported claims $ 75,246,000                
Cumulative number of reported claims 756