Secured Notes Payable and Revolving Credit Facility, Net - Schedule of Debt Statistics (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Principal balance of consolidated fixed rate debt	$ 3,580,000
Weighted average remaining life (including extension options) of consolidated fixed rate debt (in years)	5 years 10 months
Weighted average remaining fixed interest period of consolidated fixed rate debt (in years)	3 years 4 months
Weighted average annual interest rate of consolidated fixed rate debt (as a percent)	3.08%
Debt Instrument [Line Items]
Principal Balance	$ 4,087,638	$ 4,408,083
Aggregate Swapped to Fixed Rate Loans [Member]
Debt Instrument [Line Items]
Principal Balance	3,147,400	2,985,480
Aggregate Fixed Rate Loans [Member]
Debt Instrument [Line Items]
Principal Balance	429,738	1,131,603
Aggregate Floating Rate Loans [Member]
Debt Instrument [Line Items]
Principal Balance	$ 510,500	$ 291,000