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Real Estate Investments, Net - Narrative (Details) $ in Thousands, € in Millions			3 Months Ended		9 Months Ended
	Nov. 08, 2019 EUR (€) property	Nov. 08, 2019 USD ($) property	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($) property
Real Estate [Line Items]
Proceeds from dispositions of real estate investments, net					$ 141,538	$ 23,310
Gain (loss) on dispositions of real estate investments			$ 6,977	$ (1,933)	14,792	(5,751)
Impairment charges			6,375	0	$ 6,375	$ 0
Number of real estate properties held for sale | property					3
Properties Sold
Real Estate [Line Items]
Proceeds from dispositions of real estate investments, gross			53,000		$ 145,800
Gain (loss) on dispositions of real estate investments			$ 7,000		$ 14,800
United States | Properties Sold
Real Estate [Line Items]
Number of real estate properties sold | property			33		97
United Kingdom | Properties Sold
Real Estate [Line Items]
Number of real estate properties sold | property					1
Vandalia, Ohio | Properties Sold
Real Estate [Line Items]
Number of real estate properties sold | property						1
Proceeds from dispositions of real estate investments, gross				5,000
Termination fee received			$ 3,000
Repayment of mortgage in excess of proceeds				3,000
Gain (loss) on dispositions of real estate investments				$ (1,900)
San Jose, California | Properties Sold
Real Estate [Line Items]
Number of real estate properties sold | property						1
Proceeds from dispositions of real estate investments, gross						$ 20,300
Proceeds from dispositions of real estate investments, net						1,300
Gain (loss) on dispositions of real estate investments						$ (3,800)
Family Dollar | United States | Properties Sold
Real Estate [Line Items]
Number of real estate properties sold | property			32		94
Industrial Property | United States | Properties Sold
Real Estate [Line Items]
Number of real estate properties sold | property			1		3
Subsequent Event | Netherlands
Real Estate [Line Items]
Number of real estate properties sold | property	2	2
Proceeds from dispositions of real estate investments, gross	€ 17.1	$ 19,100

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