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Indebtedness Unsecured Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2020
Feb. 29, 2020
Oct. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nov. 30, 2019
Aug. 31, 2019
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage 1.75% 3.05%         2.88% 3.38%
Debt Instrument, Interest Rate, Effective Percentage 1.85% 3.19%         3.96% 2.80%
Loss on debt extinguishment       $ (32,900) $ (6,320) $ (388)    
Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount $ 350,000 $ 325,000         $ 400,000 $ 175,000
Extinguishment of Debt, Amount 216,300 300,000 $ 250,000          
Loss on debt extinguishment $ 15,100 $ 17,800 $ 6,300          
Stated Interest Rate on Extinguished Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage 3.88% 4.38% 3.88%          
Effective Interest Rate on Extinguished Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage     3.91%          
Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum       101.00%        
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum       138.00%        
Debt Instrument, Covenant Compliance       We were in compliance with all such financial covenants at