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Indebtedness Unsecured Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 29, 2020
Mar. 31, 2020
Mar. 31, 2019
Feb. 28, 2020
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage       3.05%
Issuance Price of Notes as a Percentage of Par Value       97.35%
Debt Instrument, Interest Rate, Effective Percentage       3.19%
Loss on extinguishment of debt   $ (17,806) $ (13)  
Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum   80.00%    
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum   125.00%    
Debt Instrument, Covenant Compliance   We were in compliance with all such financial covenants at    
Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount       $ 325,000
Extinguishment of Debt, Amount $ 300,000      
Loss on extinguishment of debt   $ 17,800