Organization (Details) ft² in Millions		1 Months Ended	12 Months Ended
	Jul. 19, 2018	Mar. 31, 2019 $ / shares	Dec. 31, 2019 ft² employee property $ / shares shares	Dec. 31, 2018 $ / shares shares	Jun. 30, 2018 shares
Operations [Line Items]
Number of real estate properties | property			819
Area of real estate property | ft²			18.5
Percentage of property leased			94.60%
Number of employees | employee			0
Common stock, outstanding (in shares)			108,475,266	106,230,901	105,058,793
Preferred stock dividend rate			7.50%
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01	$ 0
Net Leased Commercial Properties
Operations [Line Items]
Number of real estate properties | property			786
Net Leased Retail Properties
Operations [Line Items]
Number of real estate properties | property			748
Stabilized Core Retail Properties
Operations [Line Items]
Number of real estate properties | property			33
Class A
Operations [Line Items]
Common stock, outstanding (in shares)				79,966,215
Class B-1
Operations [Line Items]
Common stock, outstanding (in shares)			0
Class B2
Operations [Line Items]
Common stock, outstanding (in shares)			0	26,264,686
Series A Cumulative Redeemable Perpetual Preferred Stock
Operations [Line Items]
Preferred stock dividend rate		7.50%	7.50%
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01
Nasdaq Listing | Class A
Operations [Line Items]
Percentage of outstanding shares	50.00%
Nasdaq Listing | Class B-1
Operations [Line Items]
Percentage of outstanding shares	25.00%
Nasdaq Listing | Class B2
Operations [Line Items]
Percentage of outstanding shares	25.00%
Common Stock
Operations [Line Items]
Common stock, outstanding (in shares)			108,500,000	106,200,000
Common Stock | Class A
Operations [Line Items]
Common stock, outstanding (in shares)			80,000,000.0
Common Stock | Class B2
Operations [Line Items]
Common stock, outstanding (in shares)			26,200,000