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Investments (Allowance for Credit Losses and Recorded Investment in Commercial Mortgage and Other Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for credit losses:      
Individually evaluated for impairment $ 0 $ 0  
Collectively evaluated for impairment 2,650 2,289  
Total ending balance 2,650 2,289 $ 643
Recorded Investment:      
Individually evaluated for impairment 6,436 1,715  
Collectively evaluated for impairment 1,383,226 1,232,467  
Total ending balance 1,389,662 1,234,182  
Receivables Acquired with Deteriorated Credit Quality      
Recorded Investment:      
Financing Receivable Total 0 0  
Commercial Mortgage Loans      
Allowance for credit losses:      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 2,616 2,267  
Total ending balance 2,616 2,267 622
Recorded Investment:      
Individually evaluated for impairment 1,571 1,715  
Collectively evaluated for impairment 1,328,894 1,148,232  
Total ending balance 1,330,465 1,149,947  
Agricultural Property Loans      
Allowance for credit losses:      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 34 22  
Total ending balance 34 22 $ 21
Recorded Investment:      
Individually evaluated for impairment 4,865 0  
Collectively evaluated for impairment 54,332 84,235  
Total ending balance $ 59,197 $ 84,235