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Indebtedness (Schedule of Outstanding Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Debt Discount and Unamortized Issuance Cost $ 10,235    
Finance lease liabilities 904 [1] $ 900 $ 0 [1]
Long-term Debt $ 550,669    
Long-term Debt     439,540
Five Point Three Hundred Seventy Five Senior Notes [Member]      
Debt Instrument [Line Items]      
Interest Rate 5.375%    
Original Amount $ 300,000    
Debt Discount and Unamortized Issuance Cost 9,065    
Long-term Debt $ 290,935    
Long-term Debt     0
Five Point Eight Hundred Seventy Five Senior Notes [Member]      
Debt Instrument [Line Items]      
Interest Rate 5.875%    
Original Amount $ 185,000    
Debt Discount and Unamortized Issuance Cost 0    
Long-term Debt $ 0    
Long-term Debt     180,771
Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]      
Debt Instrument [Line Items]      
Interest Rate 3.03%    
Original Amount $ 60,000    
Debt Discount and Unamortized Issuance Cost 0    
Long-term Debt $ 60,000    
Long-term Debt     60,000
One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member]      
Debt Instrument [Line Items]      
Interest Rate 1.56%    
Original Amount $ 25,000    
Debt Discount and Unamortized Issuance Cost 0    
Long-term Debt $ 25,000    
Long-term Debt     25,000
One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member]      
Debt Instrument [Line Items]      
Interest Rate 1.61%    
Original Amount $ 25,000    
Debt Discount and Unamortized Issuance Cost 0    
Long-term Debt $ 25,000    
Long-term Debt     25,000
Six Point Seventy Percent Senior Notes [Member]      
Debt Instrument [Line Items]      
Interest Rate 6.70%    
Original Amount $ 100,000    
Debt Discount and Unamortized Issuance Cost 889    
Long-term Debt $ 99,111    
Long-term Debt     99,069
Seven Point Twenty Five Percent Senior Notes [Member]      
Debt Instrument [Line Items]      
Interest Rate 7.25%    
Original Amount $ 50,000    
Debt Discount and Unamortized Issuance Cost 281    
Long-term Debt $ 49,719    
Long-term Debt     $ 49,700
[1] Concurrent with the adoption of ASU 2016-02 discussed in Note 2. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.