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Life, Accident and Health Reserves - By Product Line (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves $ 4,707,400 $ 1,693,961
Long-term care insurance reserves    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves 4,115,726 1,453,442
Traditional life insurance reserves    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves 318,996 99,951
Other accident and health insurance reserves    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves $ 272,678 $ 140,568