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Liability for Unpaid Losses and Loss Adjustment Expenses - Summary of Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Claims Development [Line Items]          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 929,128        
All outstanding liabilities before 2013, net of reinsurance (3,469)        
Liabilities for claims and claim adjustment expenses, net of reinsurance 55,542        
Accident Year 2013 [Member]          
Claims Development [Line Items]          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 95,383 $ 95,059 $ 93,489 $ 88,843 $ 61,117
Accident Year 2014 [Member]          
Claims Development [Line Items]          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 122,579 119,798 112,059 $ 69,703  
Accident Year 2015 [Member]          
Claims Development [Line Items]          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 208,592 191,481 $ 115,328    
Accident Year 2016 [Member]          
Claims Development [Line Items]          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 297,374 $ 204,122      
Accident Year 2017 [Member]          
Claims Development [Line Items]          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 205,200