Related Party Transactions and Arrangements (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Equity in income and gain on disposition of unconsolidated entities	$ 505,000	$ 327,000	$ 1,005,000	$ 1,392,000
Cole Real Estate Investments, Inc. [Member]
Related Party Transaction [Line Items]
Equity in income and gain on disposition of unconsolidated entities			600,000
Aggregate equity investments	7,600,000		7,600,000		$ 7,800,000
Gain included in other income, net				5,102,000
Unrealized loss included in other comprehensive income, net			(292,000)	0
Cole Real Estate Investments, Inc. [Member]
Related Party Transaction [Line Items]
Property management fee revenue	$ 0	$ 100,000	$ 0	$ 7,900,000