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Real Estate Investments, Net - Dispositions (Details) $ in Thousands, € in Millions, £ in Millions	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 31, 2018 EUR (€)	Sep. 30, 2018 USD ($) property	Dec. 31, 2017 GBP (£)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) property	Sep. 30, 2017 USD ($) property	Dec. 31, 2017 property
Real Estate [Line Items]
Number of real estate properties held for sale (property) | property					0		0
Proceeds from dispositions of real estate investments, net					$ 23,310	$ 12,440
(Loss) gain on dispositions of real estate investments		$ (1,933)		$ 275	(5,751)	1,089
Reduction to gain on prior disposition				100		100
Advisor
Real Estate [Line Items]
(Loss) gain on dispositions of real estate investments				$ 300		$ 800
Kulicke & Soffa
Real Estate [Line Items]
Number of properties sold (property) | property						1
Mortgages
Real Estate [Line Items]
Repayments of mortgage debt	€ (0.1)	$ (3,000)	£ (0.8)		(1,700)
Properties Sold
Real Estate [Line Items]
Proceeds from dispositions of real estate investments, net					25,300
(Loss) gain on dispositions of real estate investments					$ (5,800)
Properties Sold | Kulicke & Soffa
Real Estate [Line Items]
Proceeds from dispositions of real estate investments, net						$ 12,400
(Loss) gain on dispositions of real estate investments						400
Proceeds from dispositions of real estate investments, gross						$ 13,000
Vandalia, Ohio | Properties Sold
Real Estate [Line Items]
Number of properties sold (property) | property		1
Proceeds from dispositions of real estate investments, net		$ 5,000
Lease termination fee		3,000
(Loss) gain on dispositions of real estate investments		(1,900)
San Jose, California | Properties Sold
Real Estate [Line Items]
Number of properties sold (property) | property					1
Proceeds from dispositions of real estate investments, net					$ 1,300
(Loss) gain on dispositions of real estate investments		(3,800)
Proceeds from dispositions of real estate investments, gross		$ 20,300

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Amount of gain (loss) on termination of lease before expiration of lease term.

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-Publisher FASB
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