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Reinsurance - ILN Transactions (Details) - USD ($)
$ in Thousands
Jul. 30, 2019
Jul. 25, 2018
May 02, 2017
2017 ILN Transaction      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Initial Reinsurance Coverage     $ 211,320
Current Reinsurance Coverage     46,990
Initial First Layer Retained Loss     126,793
Current First Layer Retained Loss     $ 122,810
2018 ILN Transaction      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Initial Reinsurance Coverage   $ 264,545  
Current Reinsurance Coverage   174,340  
Initial First Layer Retained Loss   125,312  
Current First Layer Retained Loss   $ 124,311  
2019 ILN Transaction      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Initial Reinsurance Coverage $ 326,905    
Current Reinsurance Coverage 259,047    
Initial First Layer Retained Loss 123,424    
Current First Layer Retained Loss $ 123,424