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Life, Accident and Health Reserves - Liability for Claims of Long-Term Care Insurance Reserves (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Beginning balance as of January 1, $ 1,591,937
Paid related to insured events of:  
Ending balance as of December 31, 1,648,565
Other Long Duration Insurance Product Line  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Beginning balance as of January 1, 208,150
Less: recoverable from reinsurers (94,041)
Net balance as of January 1, 114,109
Incurred related to insured events of:  
Current year 54,521
Prior year 631
Total incurred 55,152
Paid related to insured events of:  
Current year (8,097)
Prior year (36,457)
Total paid (44,554)
Interest on liability for policy and contract claims 4,405
Net balance as of December 31, 129,112
Add: recoverable from reinsurers 97,858
Ending balance as of December 31, $ 226,970