Fair Value Disclosures (Estimated Fair Value of Notes Payable) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Estimated fair values of notes payable [Abstract]
Notes payable, net (Note 8)	$ 3,710,327	$ 3,830,195
Fair Value, Inputs, Level 2 [Member]
Estimated fair values of notes payable [Abstract]
Notes payable, fair value disclosure	$ 3,753,531	$ 3,755,757
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	$ 131,800
Impact Of Overall One Percent Increase In Interest Rates Decrease In Fair Values Of Notes Payable Percent	3.50%