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Investments (Allowance for Credit Losses and Recorded Investment in Commercial Mortgage and Other Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for credit losses:      
Individually evaluated for impairment $ 0 $ 0  
Collectively evaluated for impairment 2,058 2,065  
Total ending balance 2,058 2,065 $ 1,794
Recorded investment:      
Individually evaluated for impairment 0 816  
Collectively evaluated for impairment 1,214,676 1,210,399  
Total ending balance 1,214,676 1,211,215  
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 2,016 2,026  
Total ending balance 2,016 2,026 1,728
Recorded investment:      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 1,159,843 1,155,777  
Total ending balance 1,159,843 1,155,777  
Agricultural Property Loans      
Allowance for credit losses:      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 42 39  
Total ending balance 42 39 $ 66
Recorded investment:      
Individually evaluated for impairment 0 816  
Collectively evaluated for impairment 54,833 54,622  
Total ending balance $ 54,833 $ 55,438