Related Party Transactions and Arrangements - Investment in the Cole REITs (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Equity in income and gain on disposition of unconsolidated entities	$ 1,869	$ 2,763	$ 9,783
Aggregate equity investments	7,844	3,264
Net (loss) income	1,869	2,726	(415)
Cole REITs [Member]
Related Party Transaction [Line Items]
Net (loss) income		(500)	$ (1,300)
Cole REITs [Member]
Related Party Transaction [Line Items]
Equity in income and gain on disposition of unconsolidated entities	600
Aggregate equity investments	7,800	$ 3,300
Cole Real Estate Investments, Inc. [Member]
Related Party Transaction [Line Items]
Gain included in other income, net	$ 5,102

Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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