Summary of Significant Accounting Policies - Reclassification (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Land	$ 804,830	$ 859,113
Buildings and improvements	15,449,884	15,610,992
Construction in progress and space held for development	1,732,555	1,621,928
Land held for future development	$ 147,597	162,941
Previously Reported
Summary Of Significant Accounting Policies [Line Items]
Land		1,509,764
Buildings and improvements		16,745,210
Restatement Adjustment
Summary Of Significant Accounting Policies [Line Items]
Land		(650,651)
Buildings and improvements		(1,134,218)
Construction in progress and space held for development		1,621,928
Land held for future development		$ 162,941