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Indebtedness Unsecured Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2020
Feb. 29, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Feb. 28, 2020
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage 1.75%       1.75%     3.05%
Issuance Price of Notes as a Percentage of Par Value 99.07%       99.07%     97.35%
Debt Instrument, Interest Rate, Effective Percentage 1.85%       1.85%     3.19%
Loss on extinguishment of debt     $ (120) $ 0   $ (32,898) $ (13)  
Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum           100.00%    
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum           137.00%    
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 $ 350,000       $ 350,000     $ 325,000
Extinguishment of Debt, Amount 216,300 $ 300,000            
Loss on extinguishment of debt $ 15,100       $ 17,800      
Stated Interest Rate on Extinguished Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage 3.88%       3.88%     4.38%