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Credit Arrangements (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt payable to non-affiliates $ 97,000 $ 97,000
Trust Preferred Securities Subject to Mandatory Redemption    
Debt Instrument [Line Items]    
Preferred Stock, Liquidation Preference Per Share $ 1,000.00  
Preferred stock, shares outstanding 97,000  
Senior Notes, unaffiliated    
Debt Instrument [Line Items]    
Long-term debt payable to non-affiliates $ 97,000  
5% Subordinated Deferrable Interest Notes, due June 30, 2047    
Debt Instrument [Line Items]    
Long-term debt payable to non-affiliates 100,000  
Trust Preferred Securities Subject to Mandatory Redemption    
Debt Instrument [Line Items]    
Long-term debt payable to non-affiliates 97,000  
Capital trust equity    
Debt Instrument [Line Items]    
Long-term debt payable to non-affiliates $ 3,000