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Life, Accident and Health Reserves - Liability for Claims of Long-Term Care Insurance Reserves (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning balance $ 1,693,961      
Paid related to insured events of:        
Ending balance 4,707,400      
Other Long Duration Insurance Product Line        
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning balance 243,456 $ 226,970    
Less: recoverable from reinsurers (100,611) (97,858)    
Beginning balance, net 507,897 141,354 $ 142,845 $ 129,112
Incurred related to insured events of:        
Current year 54,455 44,611    
Prior years 6,053 (1,449)    
Total incurred 60,508 43,162    
Paid related to insured events of:        
Current year (3,927) (4,054)    
Prior years (36,868) (30,505)    
Total paid (40,795) (34,559)    
Interest on liability for policy and contract claims 4,128 3,639    
Reserve for business acquired during the current period 341,211 0    
Ending balance, net 507,897 141,354    
Add: recoverable from reinsurers 159,055 115,176    
Ending balance $ 666,952 $ 256,530