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Capital (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Aug. 23, 2016	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Partners' Capital [Line Items]
Gross proceeds from sale of shares	$ 621,800	$ 4,700	$ 4,749	$ 0	$ 611,206
Shares and Units [Abstract]
OP units outstanding (shares)			303,300,000
OP units owned by the Company (shares)			174,900,000
OP units owned by the Company, percent			57.70%
OP units not owned by the Company (shares)			128,400,000
OP units not owned by the Company, percent			42.30%
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%
Private perpetual preferred units, liquidation preference per share (in dollars per share)			$ 16.62	$ 16.62
Series PR Common Units
Shares and Units [Abstract]
OP units not owned by the Company (shares)			86,202,638	91,759,741
Private Perpetual Preferred Units
Shares and Units [Abstract]
Private perpetual preferred units (shares)			1,560,360
Private perpetual preferred units, liquidation preference per share (in dollars per share)			$ 16.62
Dividend declared (in dollars per share)			$ 0.60
Common shares | Common Class A
Partners' Capital [Line Items]
Issuance of common shares (in shares)		284,015			29,610,854
Common shares issued (USD per share)	$ 21.00	$ 16.72
General Partner | Series PR Common Units
Partners' Capital [Line Items]
Issuance of common shares (in shares)	29,610,854		284,000		29,611,000
Q REIT Holding LLC
Partners' Capital [Line Items]
Interest held by subsidiary of QIA	9.90%	9.90%

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