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Life, Accident and Health Reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves $ 1,648,565 $ 1,591,937
Long-term care insurance reserves    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves 1,407,848 1,354,151
Traditional life insurance reserves    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves 102,077 104,450
Other accident and health insurance reserves    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total life, accident and health reserves $ 138,640 $ 133,336