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Debt Debt (Schedule of Long Term Debt Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Unsecured Debt   $ 400,000
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months $ 1,230  
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two 61,279  
Long-term Debt, Maturities, Repayments of Principal in Year Three 551,328  
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four 476,379  
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five 76,429  
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five 282,437  
Long-term Debt, Gross 1,449,082  
Debt Instrument, Unamortized Discount (1,541)  
Less: unamortized loan costs 7,076 9,884
Debt, Long-term and Short-term, Combined Amount 1,440,465 1,281,675
Private Placement [Member]    
Unsecured Debt 400,000 $ 400,000
January 2023 [Member]    
Unsecured Debt $ 125,000  
Debt Instrument, Interest Rate, Stated Percentage 3.99%  
November 2023 [Member]    
Unsecured Debt $ 50,000  
Debt Instrument, Interest Rate, Stated Percentage 3.99%  
September 2024 [Member]    
Unsecured Debt $ 75,000  
Debt Instrument, Interest Rate, Stated Percentage 3.93%  
November 2025 [Member]    
Unsecured Debt $ 50,000  
Debt Instrument, Interest Rate, Stated Percentage 4.33%  
January 2027 [Member]    
Unsecured Debt $ 100,000  
Debt Instrument, Interest Rate, Stated Percentage 4.51%