Discontinued Operations - Effective Tax Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total (benefit from) provision for income taxes - Cole Capital	$ 4,262,000	$ 5,101,000	$ 6,882,000
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]
Loss before taxes		1,600,000	(5,278,000)
Less: Income from non-taxable entities		(685,000)	(9,523,000)
Loss attributable to taxable subsidiaries before income taxes		915,000	(14,801,000)
Federal provision at statutory rate (35%)		192,000	(5,180,000)
Impairment of goodwill		0	0
Nondeductible portion of transaction costs and loss recognized on classification as held for sale		(719,000)	8,283,000
Impact of change in federal tax rate		0	3,481,000
Impact of valuation allowance		(1,158,000)	6,165,000
State income taxes and other		(410,000)	1,090,000
Total (benefit from) provision for income taxes - Cole Capital	$ 0	$ (2,095,000)	$ 13,839,000