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Capital (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Aug. 23, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Class of Stock [Line Items]
Gross proceeds from sale of shares	$ 621,800	$ 611,278	$ 0
Shares and Units [Abstract]
OP units outstanding (in shares)		299,099,533
OP units owned by the Company (in shares)		154,925,644
OP units owned by the Company, percent		51.80%
OP units not owned by the Company (in shares)		144,173,889
OP units not owned by the Company, percent		48.20%
Percentage of dividends on common stock received until performance criteria met for LTIP units		10.00%
Percentage of dividends on common stock received after performance criteria met for LTIP units		90.00%
Percentage of dividends on common stock received in periods after performance criteria met for LTIP units		100.00%
Series PR operating partnership units
Shares and Units [Abstract]
OP units not owned by the Company (in shares)		93,507,101		93,863,451
Qatar Investment Authority, affiliate
Class of Stock [Line Items]
Economic interest held by affiliate of QIA	9.90%
Common shares | Common class A shares
Class of Stock [Line Items]
Issuance of common shares (in shares)	29,610,854
Common shares issued (in dollars per share)	$ 21.00
General partner | Series PR operating partnership units
Class of Stock [Line Items]
Issuance of common shares (in shares)	29,610,854	29,611,000

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