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Indebtedness Unsecured Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Oct. 31, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2019
Aug. 31, 2019
Debt Instrument [Line Items]              
Debt Instrument, Face Amount $ 250,000 $ 450,000       $ 400,000  
Debt Instrument, Interest Rate, Stated Percentage 3.88% 4.00%       2.88% 3.38%
Debt Instrument, Interest Rate, Effective Percentage 3.91% 4.13%       3.96% 2.80%
Payment for Debt Extinguishment or Debt Prepayment Cost $ 6,300            
Long-term Debt     $ 2,914,765 $ 2,658,501      
Loss on debt extinguishment     (6,320) (388) $ (26,104)    
Repayments of Secured Debt     $ 45,515 232,234 72,648    
Repaid Debt, Weighted Average Interest Rate   7.63%          
Document Period End Date     Dec. 31, 2019        
London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Description of Variable Rate Basis     LIBOR        
Unsecured Debt [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount         $ 300,000   $ 175,000
Long-term Debt     $ 2,900,000 $ 2,575,000      
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     129.00%        
Debt Instrument, Covenant Compliance     We were in compliance with all such financial covenants at        
Loans Payable [Member]              
Debt Instrument [Line Items]              
Repayments of Secured Debt   $ 223,900