Notes Payable and Revolving Lines of Credit - Schedule of Components of Notes Payable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total	$ 4,797,303	$ 4,318,973
Notes Payable
Debt Instrument [Line Items]
Total	4,818,771	4,343,502
Unamortized debt issuance costs	(21,468)	(24,529)
Total	4,797,303	4,318,973
Notes Payable | Secured notes payable
Debt Instrument [Line Items]
Fixed rate notes payable	1,112,220	1,365,408
Variable rate notes payable	$ 1,081,551	878,093
Notes Payable | Secured notes payable | Minimum
Debt Instrument [Line Items]
Fixed Rate	2.53%
Variable Rate	1.39%
Notes Payable | Secured notes payable | Maximum
Debt Instrument [Line Items]
Fixed Rate	5.85%
Variable Rate	2.20%
Notes Payable | Secured notes payable | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.30%
Notes Payable | Secured notes payable | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Notes Payable | Unsecured notes payable
Debt Instrument [Line Items]
Fixed rate notes payable	$ 2,525,000	2,052,521
Variable rate notes payable	$ 100,000	$ 47,480
Notes Payable | Unsecured notes payable | Minimum
Debt Instrument [Line Items]
Fixed Rate	2.80%
Variable Rate	1.04%
Notes Payable | Unsecured notes payable | Maximum
Debt Instrument [Line Items]
Fixed Rate	4.39%
Notes Payable | Unsecured notes payable | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.90%