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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 2,704 2,896  
Total ending balance 2,704 2,896 $ 2,650
Recorded Investment:      
Individually evaluated for impairment 0 3,439  
Collectively evaluated for impairment 1,271,081 1,352,935  
Total ending balance 1,271,081 1,356,374  
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 2,656 2,861  
Total ending balance 2,656 2,861 2,616
Recorded Investment:      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 1,217,673 1,301,999  
Total ending balance 1,217,673 1,301,999  
Agricultural Property Loans      
Allowance for Credit Losses:      
Individually evaluated for impairment 0 0  
Collectively evaluated for impairment 48 35  
Total ending balance 48 35 $ 34
Recorded Investment:      
Individually evaluated for impairment 0 3,439  
Collectively evaluated for impairment 53,408 50,936  
Total ending balance $ 53,408 $ 54,375