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Fair Value Disclosures (Estimated Fair Value of Notes Payable) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Real Estate Properties [Line Items]    
Notes Payable, Net $ 4,003,126 $ 3,710,327
Fair Value, Inputs, Level 2 [Member]    
Real Estate Properties [Line Items]    
Notes Payable, Fair Value Disclosure $ 4,215,162 $ 3,753,531
Notes Payable Fair Values Hypothetical Percent Increase In Interest Rates 1.00%  
Impact Of Overall One Percent Increase In Interest Rates Decrease In Fair Values Of Notes Payable $ 139,800  
Impact Of Overall One Percent Increase In Interest Rates Decrease In Fair Values Of Notes Payable Percent 3.30%