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Related Party Transactions - Schedule of Amount Contractually Due and Forgiven in Connection With Operation Related Services (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Due from related parties	$ 16,000		$ 16,000		$ 16,000
Advisor
Related Party Transaction [Line Items]
Incentive compensation earned	$ 0	$ 0	$ 0	$ 0
Advisor | United States
Related Party Transaction [Line Items]
Percent of fees waived	100.00%		100.00%
Variable Base Management Fee | Advisor
Related Party Transaction [Line Items]
Related party expenses	$ 700,000	0	$ 1,400,000	0
Transfer Asset and Personnel Services
Related Party Transaction [Line Items]
Related party expenses					500,000
Transfer Asset and Personnel Services | General and Administrative Expense
Related Party Transaction [Line Items]
Related party expenses			300,000
Transfer Asset and Personnel Services | Affiliated Entity
Related Party Transaction [Line Items]
Related party expenses					200,000
Transfer Asset and Personnel Services | Affiliated Entity | General and Administrative Expense
Related Party Transaction [Line Items]
Related party expenses			36,000
Transfer Asset and Personnel Services | Advisor and Dealer Manager
Related Party Transaction [Line Items]
Related party expenses					300,000
Transfer Asset and Personnel Services | Advisor and Dealer Manager | General and Administrative Expense
Related Party Transaction [Line Items]
Related party expenses			200,000
Incurred
Related Party Transaction [Line Items]
Related party expenses	6,333,000	5,522,000	12,620,000	10,935,000
Incurred | General and Administrative Expense
Related Party Transaction [Line Items]
Related party expenses	48,000		48,000
Forgiven
Related Party Transaction [Line Items]
Related party expenses	620,000	563,000	1,177,000	1,159,000
Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	(377,000)		(377,000)		(3,500,000)
Nonrecurring Fees | Related party notes receivable acquired in Merger | Incurred
Related Party Transaction [Line Items]
Related party expenses	0	0	0	0
Nonrecurring Fees | Related party notes receivable acquired in Merger | Forgiven
Related Party Transaction [Line Items]
Related party expenses	0	0	0	0
Nonrecurring Fees | Related party notes receivable acquired in Merger | Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	(1,285,000)		(1,285,000)		(5,138,000)
Nonrecurring Fees | Fees on gain from sale of investments | Incurred
Related Party Transaction [Line Items]
Related party expenses	0	0	0	0
Nonrecurring Fees | Fees on gain from sale of investments | Forgiven
Related Party Transaction [Line Items]
Related party expenses	0	0	0	0
Nonrecurring Fees | Fees on gain from sale of investments | Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	323,000		323,000		923,000
Nonrecurring Fees | Financing coordination fees | Incurred
Related Party Transaction [Line Items]
Related party expenses	0	0	0	0
Nonrecurring Fees | Financing coordination fees | Forgiven
Related Party Transaction [Line Items]
Related party expenses	0	0	0	0
Nonrecurring Fees | Financing coordination fees | Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	0		0		16,000
Recurring Fees | Asset management fees | Incurred
Related Party Transaction [Line Items]
Related party expenses	5,207,000	4,500,000	10,397,000	9,000,000
Recurring Fees | Asset management fees | Forgiven
Related Party Transaction [Line Items]
Related party expenses	0	0	0	0
Recurring Fees | Asset management fees | Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	233,000		233,000		447,000
Recurring Fees | Property management fees | Incurred
Related Party Transaction [Line Items]
Related party expenses	1,126,000	1,022,000	2,223,000	1,935,000
Recurring Fees | Property management fees | Forgiven
Related Party Transaction [Line Items]
Related party expenses	620,000	563,000	1,177,000	1,159,000
Recurring Fees | Property management fees | Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	352,000		352,000		252,000
Prepaid Expenses and Other Current Assets [Member] | Recurring Fees | Property management fees | Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	(131,000)		(131,000)		$ (100,000)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Related Party Transaction [Line Items]
Gain (loss) on sale of property			$ 600,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Advisor
Related Party Transaction [Line Items]
Gain (loss) on sale of property	$ 0	$ 0		$ 0

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