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Related Party Transactions and Arrangements - Investment in the Cole REITs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Equity in income and gain on disposition of unconsolidated entities	$ 252	$ 374	$ 1,644	$ 805
Aggregate equity investments	7,844		7,844		$ 3,264
Net (loss) income			1,644	805
Cole REITs [Member]
Related Party Transaction [Line Items]
Net (loss) income				$ (500)
Cole REITs [Member]
Related Party Transaction [Line Items]
Equity in income and gain on disposition of unconsolidated entities			600
Aggregate equity investments	$ 7,800		7,800		$ 3,300
Cole Real Estate Investments, Inc. [Member]
Related Party Transaction [Line Items]
Gain included in other income, net			$ 5,102
Maximum [Member] \| Cole REITs [Member]
Related Party Transaction [Line Items]
Net (loss) income		$ (100)