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Fair Value of Assets and Liabilities - Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Secured debts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Principal mortgage obligations   $ 3,015
Debt issuance costs   25
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value disclosure $ 3,298,935 2,518,410
Carrying Amount | Senior unsecured notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value disclosure 2,606,550 1,820,681
Carrying Amount | Secured debts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value disclosure 692,385 697,729
Estimated Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value disclosure 3,263,986 2,587,528
Estimated Fair Value | Senior unsecured notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value disclosure 2,558,483 1,890,386
Estimated Fair Value | Secured debts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value disclosure $ 705,503 $ 697,142