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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance $ 1,605,276        
All outstanding liabilities before 2015, net of reinsurance (208)        
Liabilities for claims and claim adjustment expenses, net of reinsurance 129,455        
Accident Year 2015 [Member]          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 226,550 $ 219,941 $ 208,592 $ 191,481 $ 115,328
Accident Year 2016 [Member]          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 349,837 328,286 297,374 $ 204,122  
Accident Year 2017 [Member]          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 365,588 328,105 $ 205,200    
Accident Year 2018 [Member]          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 327,310 $ 253,008      
Accident Year 2019 [Member]          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance $ 335,991