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Indebtedness Indebtedness (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]    
Schedule of Debt Instruments [Line Items]    
Debt Discount and Unamortized Issuance Costs $ 0  
Interest Rate 3.03%  
Long-term Debt, Gross $ 60,000  
Long-term Debt 60,000 $ 60,000
One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member]    
Schedule of Debt Instruments [Line Items]    
Debt Discount and Unamortized Issuance Costs $ 0  
Interest Rate 1.56%  
Long-term Debt, Gross $ 25,000  
Long-term Debt 25,000 25,000
One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member]    
Schedule of Debt Instruments [Line Items]    
Debt Discount and Unamortized Issuance Costs $ 0  
Interest Rate 1.61%  
Long-term Debt, Gross $ 25,000  
Long-term Debt 25,000 25,000
Five Point Eight Hundred Seventy Five Percent Senior Notes [Member]    
Schedule of Debt Instruments [Line Items]    
Debt Discount and Unamortized Issuance Costs $ (4,229)  
Interest Rate 5.875%  
Long-term Debt, Gross $ 185,000  
Long-term Debt 180,771 180,430
Six Point Seventy Percent Senior Notes [Member]    
Schedule of Debt Instruments [Line Items]    
Debt Discount and Unamortized Issuance Costs $ (931)  
Interest Rate 6.70%  
Long-term Debt, Gross $ 100,000  
Long-term Debt 99,069 99,011
Seven Point Twenty Five Percent Senior Notes [Member]    
Schedule of Debt Instruments [Line Items]    
Debt Discount and Unamortized Issuance Costs $ (300)  
Interest Rate 7.25%  
Long-term Debt, Gross $ 50,000  
Long-term Debt 49,700 49,675
Long-term Debt [Member]    
Schedule of Debt Instruments [Line Items]    
Debt Discount and Unamortized Issuance Costs (5,460)  
Long-term Debt, Gross 445,000  
Long-term Debt $ 439,540 $ 439,116