Equity (Details) - USD ($) $ / shares in Units, $ in Thousands														12 Months Ended
	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 29, 2016	Sep. 30, 2016	Aug. 23, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Gross proceeds from sale of shares							$ 621,800							$ 0	$ 611,206	$ 0
Percentage of dividends on common stock received until performance criteria met for LTIP units														10.00%	10.00%
Percentage of dividends on common stock received after performance criteria met for LTIP units														90.00%	90.00%
Percentage of dividends on common stock received in periods after performance criteria met for LTIP units														100.00%	100.00%
Shares and Units [Abstract]
Net income attributable to common stockholders														$ 62,647	$ 51,456	33,730
Increase in additional paid-in capital for the conversion of OP units into common stock														0	0	0
Change from net income attributable to common stockholders and transfers from noncontrolling interests														$ 86,176	$ 75,500	$ 95,733
OP units outstanding (shares)														300,400,000
OP units owned by the Company (shares)														161,500,000
OP units owned by the Company, percent														53.80%
OP units not owned by the Company (shares)														138,900,000
OP units not owned by the Company, percent														46.20%
Private perpetual preferred units, liquidation preference per share (in dollars per share)														$ 16.62	$ 16.62
Dividends (USD per share)														$ 0.42	$ 0.40	$ 0.34
Dividends and Distributions [Abstract]
Partial dividend paid, per common share (USD per share)	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105		$ 0.105	$ 0.085	$ 0.085	$ 0.085	$ 0.085	$ 0.085
Payments of ordinary dividends, common stock														$ 66,800	$ 55,800	$ 39,200
Distributions paid to OP unitholders														59,200	58,200	51,800
Private perpetual preferred unit distributions														$ 936	$ 936	936
Dividends paid, percent taxable as ordinary dividends														100.00%
Private Perpetual Preferred Units [Member]
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
Dividends (USD per share)														$ 0.60
Common shares [Member] | Common Class A [Member]
Class of Stock [Line Items]
Issuance of common shares (in shares)							29,610,854								29,610,854
Common shares issued (USD per share)							$ 21.00
Shares and Units [Abstract]
Increase in additional paid-in capital for the conversion of OP units into common stock														$ 57	$ 62	129
Additional Paid-in Capital [Member]
Shares and Units [Abstract]
Increase in additional paid-in capital for the conversion of OP units into common stock														$ 23,529	$ 24,044	$ 62,003
Q REIT Holding LLC [Member]
Class of Stock [Line Items]
Interest held by Q REIT Holding LLC							9.90%
Q REIT Holding LLC [Member] | Common shares [Member] | Common Class A [Member]
Class of Stock [Line Items]
Interest held by Q REIT Holding LLC							19.40%