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Indebtedness Indebtedness (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Schedule of Debt Instruments [Line Items]        
Long-term debt $ 550,597     $ 439,540
Unamortized Debt Issuance Costs (3,687)      
Unamortized Debt Discount (6,453)      
Finance Lease, Liability $ 737   $ 900  
Five Point Three Hundred Seventy Five [Member]        
Schedule of Debt Instruments [Line Items]        
Interest Rate 5.375%      
Long-term Debt, Gross $ 300,000 $ 300,000    
Unamortized Debt Issuance Costs (3,147)      
Unamortized Debt Discount (5,843)      
Long-term Debt $ 291,010     0
Five Point Eight Hundred Seventy Five Percent Senior Notes [Member]        
Schedule of Debt Instruments [Line Items]        
Interest Rate 5.875%      
Long-term Debt, Gross $ 185,000      
Unamortized Debt Issuance Costs 0      
Unamortized Debt Discount 0      
Long-term Debt $ 0     180,771
Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]        
Schedule of Debt Instruments [Line Items]        
Interest Rate 3.03%      
Long-term Debt, Gross $ 60,000      
Unamortized Debt Issuance Costs 0      
Unamortized Debt Discount 0      
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]        
Interest Rate 1.56%      
Long-term Debt, Gross $ 25,000      
Unamortized Debt Issuance Costs 0      
Unamortized Debt Discount 0      
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]        
Interest Rate 1.61%      
Long-term Debt, Gross $ 25,000      
Unamortized Debt Issuance Costs 0      
Unamortized Debt Discount 0      
Long-term Debt $ 25,000     25,000
Six Point Seventy Percent Senior Notes [Member]        
Schedule of Debt Instruments [Line Items]        
Interest Rate 6.70%      
Long-term Debt, Gross $ 100,000      
Unamortized Debt Issuance Costs (355)      
Unamortized Debt Discount (520)      
Long-term Debt $ 99,125     99,069
Seven Point Twenty Five Percent Senior Notes [Member]        
Schedule of Debt Instruments [Line Items]        
Interest Rate 7.25%      
Long-term Debt, Gross $ 50,000      
Unamortized Debt Issuance Costs (185)      
Unamortized Debt Discount (90)      
Long-term Debt 49,725     49,700
Finance lease obligation [Member]        
Schedule of Debt Instruments [Line Items]        
Finance Lease, Liability [1] $ 737     $ 0
[1] Concurrent with the adoption of ASU 2016-02 discussed in Note 3. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.