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Indebtedness Unsecured Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Feb. 29, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Feb. 28, 2020
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage 1.75%   1.75%     1.75%   3.05%
Issuance Price of Notes as a Percentage of Par Value 99.07%   99.07%     99.07%   97.35%
Debt Instrument, Interest Rate, Effective Percentage 1.85%   1.85%     1.85%   3.19%
Loss on extinguishment of debt     $ (14,972)   $ 0 $ (32,778) $ (13)  
Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum           99.00%    
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum           136.00%    
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     $ 350,000   $ 325,000
Extinguishment of Debt, Amount 216,300 $ 300,000            
Loss on extinguishment of debt $ 15,000     $ 17,800        
Stated Interest Rate on Extinguished Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage 3.88%   3.88%     3.88%   4.38%