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Reserves for unpaid losses and loss adjustment expenses Reserve Development (Details)
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 $ 239,128,000              
Property [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net 15,325,000              
All outstanding liabilities before 2012, net of reinsurance 0              
Liability for claims and claim adjustment expense, net 2,700,000              
Incurred claims and claim adjustment expense, net 18,025,000              
Casualty - claims made [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net 28,404,000              
Liability for claims and claim adjustment expense, net 44,142,000              
Incurred claims and claim adjustment expense, net 72,546,000              
Casualty - occurrence [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net 82,856,000              
Liability for claims and claim adjustment expense, net 192,286,000              
Incurred claims and claim adjustment expense, net 275,142,000              
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 $ 862,000 $ 393,000 $ 368,000 $ 79,000 $ 0
Incurred claims and claim adjustment expense, net 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 $ 24,000              
Cumulative number of reported claims 14              
Accident Year 2010 [Member] | Casualty - occurrence [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 309,000 273,000 261,000 263,000 113,000 59,000 37,000 4,000
Incurred claims and claim adjustment expense, net 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 $ 76,000              
Cumulative number of reported claims 47              
Accident Year 2011 [Member] | Casualty - claims made [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 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 3,261,000 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 $ 199,000              
Cumulative number of reported claims 76              
Accident Year 2011 [Member] | Casualty - occurrence [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 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 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 $ 641,000              
Cumulative number of reported claims 214              
Accident Year 2012 [Member] | Casualty - claims made [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 1,882,000 1,090,000 1,024,000 877,000 475,000 153,000    
Incurred claims and claim adjustment expense, net 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 $ 576,000              
Cumulative number of reported claims 138              
Accident Year 2012 [Member] | Casualty - occurrence [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 16,474,000 14,382,000 11,238,000 7,850,000 4,441,000 757,000    
Incurred claims and claim adjustment expense, net 22,001,000 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 $ 2,416,000              
Cumulative number of reported claims 554              
Accident Year 2013 [Member] | Property [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 81,000 81,000 81,000 81,000 99,000      
Incurred claims and claim adjustment expense, net 81,000 88,000 103,000 205,000 417,000      
Total of IBNR liabilities plus expected development on reported claims $ 0              
Cumulative number of reported claims 7              
Accident Year 2013 [Member] | Casualty - claims made [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 5,320,000 5,070,000 4,436,000 1,915,000 499,000      
Incurred claims and claim adjustment expense, net 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 $ 1,519,000              
Cumulative number of reported claims 226              
Accident Year 2013 [Member] | Casualty - occurrence [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 21,348,000 14,890,000 7,957,000 4,469,000 1,099,000      
Incurred claims and claim adjustment expense, net 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 $ 6,371,000              
Cumulative number of reported claims 784              
Accident Year 2014 [Member] | Property [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 1,217,000 1,217,000 1,217,000 169,000        
Incurred claims and claim adjustment expense, net 1,222,000 1,240,000 1,344,000 1,561,000        
Total of IBNR liabilities plus expected development on reported claims $ 5,000              
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 $ 6,384,000 5,039,000 1,865,000 435,000        
Incurred claims and claim adjustment expense, net 11,217,000 11,748,000 14,289,000 18,847,000        
Total of IBNR liabilities plus expected development on reported claims $ 3,247,000              
Cumulative number of reported claims 271              
Accident Year 2014 [Member] | Casualty - occurrence [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 17,576,000 8,489,000 3,081,000 698,000        
Incurred claims and claim adjustment expense, net 36,678,000 38,049,000 40,668,000 $ 47,805,000        
Total of IBNR liabilities plus expected development on reported claims $ 13,822,000              
Cumulative number of reported claims 1,059              
Accident Year 2015 [Member] | Property [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 832,000 706,000 584,000          
Incurred claims and claim adjustment expense, net 857,000 880,000 1,394,000          
Total of IBNR liabilities plus expected development on reported claims $ 26,000              
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 $ 7,562,000 4,496,000 217,000          
Incurred claims and claim adjustment expense, net 14,896,000 16,777,000 18,883,000          
Total of IBNR liabilities plus expected development on reported claims $ 5,412,000              
Cumulative number of reported claims 252              
Accident Year 2015 [Member] | Casualty - occurrence [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 12,685,000 3,161,000 941,000          
Incurred claims and claim adjustment expense, net 49,122,000 51,739,000 $ 59,717,000          
Total of IBNR liabilities plus expected development on reported claims $ 25,959,000              
Cumulative number of reported claims 1,130              
Accident Year 2016 [Member] | Property [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 3,257,000 1,867,000            
Incurred claims and claim adjustment expense, net 3,392,000 4,177,000            
Total of IBNR liabilities plus expected development on reported claims $ 85,000              
Cumulative number of reported claims 282              
Accident Year 2016 [Member] | Casualty - claims made [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 3,015,000 1,158,000            
Incurred claims and claim adjustment expense, net 14,694,000 19,170,000            
Total of IBNR liabilities plus expected development on reported claims $ 9,162,000              
Cumulative number of reported claims 303              
Accident Year 2016 [Member] | Casualty - occurrence [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 6,015,000 1,099,000            
Incurred claims and claim adjustment expense, net 55,680,000 $ 61,440,000            
Total of IBNR liabilities plus expected development on reported claims $ 39,527,000              
Cumulative number of reported claims 938              
Accident Year 2017 [Member] | Property [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 9,938,000              
Incurred claims and claim adjustment expense, net 12,473,000              
Total of IBNR liabilities plus expected development on reported claims $ 624,000              
Cumulative number of reported claims 998              
Accident Year 2017 [Member] | Casualty - claims made [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 340,000              
Incurred claims and claim adjustment expense, net 18,116,000              
Total of IBNR liabilities plus expected development on reported claims $ 15,373,000              
Cumulative number of reported claims 335              
Accident Year 2017 [Member] | Casualty - occurrence [Member]                
Claims Development                
Cumulative paid claims and allocated claim adjustment expense, net $ 1,581,000              
Incurred claims and claim adjustment expense, net 71,126,000              
Total of IBNR liabilities plus expected development on reported claims $ 63,393,000              
Cumulative number of reported claims 712