Discontinued Operations - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of income taxes	$ 0	$ 224		$ 0	$ 3,725
Cole Capital [Member] | Held-for-sale or Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Offering-related fees and reimbursements		0			1,027
Transaction service fees and reimbursements		0			334
Management fees and reimbursements		0			6,452
Total revenues		0			7,813
Cole Capital reallowed fees and commissions		0			602
Transaction costs		0			(654)
General and administrative		0			4,450
Total operating expenses		0			4,398
Operating income		0			3,415
Gain (loss) on disposition and assets held for sale		224	$ (20,000)		(1,785)
Income before taxes		224			1,630
Benefit from income taxes		0			2,095
Income from discontinued operations, net of income taxes		$ 224			$ 3,725