Related Party Transactions and Arrangements - Due to Cole REITs (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Accounts payable and accrued expenses (less than)	$ 269,150	$ 136,474
Due to affiliates	0	66
Cole REITs [Member]
Related Party Transaction [Line Items]
Due to affiliates		$ 100
Maximum [Member] \| Cole REITs [Member]
Related Party Transaction [Line Items]
Accounts payable and accrued expenses (less than)	$ 100

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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