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Reinsurance Receivables - Table of the Components of Reinsurance Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Effects of Reinsurance [Line Items]    
Prepaid reinsurance premiums: $ 288,924 $ 253,682
Reinsurance receivables 392,632 352,967
Life (1)    
Effects of Reinsurance [Line Items]    
Prepaid reinsurance premiums: [1] 67,611 65,218
Ceded claim reserves: 3,295 2,988
Accident and health (1)    
Effects of Reinsurance [Line Items]    
Prepaid reinsurance premiums: [1] 59,414 56,729
Ceded claim reserves: 10,563 9,575
Property (2)    
Effects of Reinsurance [Line Items]    
Prepaid reinsurance premiums: 161,899 131,735
Ceded claim reserves: 69,307 61,406
Total ceded claim reserves recoverable    
Effects of Reinsurance [Line Items]    
Ceded claim reserves: 83,165 73,969
Other reinsurance settlements recoverable    
Effects of Reinsurance [Line Items]    
Other reinsurance settlements recoverable $ 20,543 $ 25,316
[1] Including policyholder account balances ceded.