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Life, Accident and Health Reserves - By Product Line (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves $ 1,683,568 $ 1,648,565
Long-term care insurance reserves    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves 1,442,586 1,407,848
Traditional life insurance reserves    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves 100,076 102,077
Other accident and health insurance reserves    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves $ 140,906 $ 138,640