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Reinsurance (Details)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 46 Months Ended
Jun. 30, 2017
USD ($)
Feb. 28, 2015
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Counterparty
Dec. 31, 2017
USD ($)
Counterparty
Dec. 31, 2016
USD ($)
Counterparty
Dec. 31, 2018
USD ($)
Reinsurance Retention Policy                    
Retention amount             $ 700 $ 1,500    
Ceded written premiums     $ 24,632 $ 26,674 $ 50,737 $ 40,436 82,949 46,951 $ 29,636  
Prepaid reinsurance premium     $ 22,467   $ 22,467   $ 18,284 $ 3,175   $ 18,284
Number of Company's largest reinsurers | Counterparty             3 3 3  
Reinsurance premiums ceded             $ 67,862 $ 45,416 $ 28,994  
Percentage of reinsurance premiums ceded on total premium             24.00% 20.80% 19.50%  
Percentage of reinsurance recoverable on paid and unpaid losses on total balance             23.00% 26.70%    
Non-earthquake events                    
Reinsurance Retention Policy                    
Retention amount   $ 15,000               $ 5,000
Non-earthquake events | Losses between $230 million and $351 million                    
Reinsurance Retention Policy                    
Percentage of losses retains             54.55%     54.55%
Non-earthquake events | Losses between $351 million and $501 million                    
Reinsurance Retention Policy                    
Percentage of losses retains             30.00%     30.00%
Non-earthquake events | Maximum                    
Reinsurance Retention Policy                    
XOL coverage             $ 625,000 $ 550,000   $ 625,000
Earthquake events                    
Reinsurance Retention Policy                    
Retention amount             5,000 15,000    
Earthquake events | Maximum                    
Reinsurance Retention Policy                    
XOL coverage             825,000 750,000   825,000
Texas Homeowners                    
Reinsurance Retention Policy                    
Ceded written premiums             24,900 2,400 $ 2,300  
Torrey Pines Re Ltd. ("TPRe") | Catastrophe                    
Reinsurance Retention Policy                    
Notes issued for reinsurance coverage $ 166,000                  
Reinsurance premiums ceded             7,500      
Duration of reinsurance coverage 3 years                  
First largest insurer                    
Reinsurance Retention Policy                    
Reinsurance premiums ceded             7,500 4,000 2,300  
Reinsurance recoverables on paid and unpaid losses             1,800 1,900   1,800
Second largest insurer                    
Reinsurance Retention Policy                    
Reinsurance premiums ceded             7,200 3,400 1,800  
Reinsurance recoverables on paid and unpaid losses             800 1,100   800
Third largest insurer                    
Reinsurance Retention Policy                    
Reinsurance premiums ceded             5,200 2,400 $ 1,700  
Reinsurance recoverables on paid and unpaid losses             $ 800 $ 800   $ 800