Related Party Transactions and Arrangements (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Equity in income and gain on disposition of unconsolidated entities	$ 677,000	$ 252,000	$ 1,682,000	$ 1,644,000
Aggregate equity investments	7,552,000		7,552,000		$ 7,844,000
CCIT II, CCIT III and CCPT V [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				5,100,000
Unrealized loss included in other comprehensive income, net			(300,000)
Cole Real Estate Investments, Inc. [Member]
Related Party Transaction [Line Items]
Property management fee revenue	$ 0	$ 100,000	$ 0	$ 8,000,000.0