Debt - Narrative (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) instrument extension	Dec. 31, 2016 USD ($)
Unsecured Debt [Member]
Debt Instrument [Line Items]
Unamortized discount (premium), net	$ 2,600,000	$ 100,000
Unamortized debt issuance expense	17,300,000	18,100,000
Lines of credit, net [Member]
Debt Instrument [Line Items]
Unamortized debt issuance expense	$ 4,000,000	3,300,000
Number of lines of unsecured credit (in instruments) | instrument	2
Aggregate borrowing capacity	$ 1,030,000,000
Lines of credit, net [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 1,000,000,000
Number of extension options (in extensions) | extension	1
Extension period (in months)	18 months
Lines of credit, net [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	0.90%
Lines of credit, net [Member] | Line of Credit Working Capital [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 25,000,000
Lines of credit, net [Member] | Line of Credit Working Capital [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	0.90%
Mortgage notes payable, net [Member]
Debt Instrument [Line Items]
Unamortized discount (premium), net	$ 46,000,000	50,800,000
Unamortized debt issuance expense	$ 6,900,000	$ 7,400,000