Related Party Transactions (Summary of Fees and Expense Reimbursements Incurred) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	$ 58,177	$ 24,988	$ 32,856
Due from (to) related party	(42,782)	(26,022)
Dealer Manager | Selling Commissions
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	7,481	837	4,021
Due from (to) related party	0	(4)
Dealer Manager | Dealer Manager Fee
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	1,337	146	1,744
Due from (to) related party	0	(3)
Dealer Manager | Distribution and Servicing Fees
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	17,696	2,411	4,947
Due from (to) related party	(22,479)	(8,332)
The Advisor | Organization and Offering Costs
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	4,445	3,273	4,753
Due from (to) related party	(7,763)	(9,001)
The Advisor | Acquisition Fee
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	0	0	6,741
Due from (to) related party	0	0
The Advisor | Asset Management Fee
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	7,985	5,004	4,940
Due from (to) related party	(2,353)	(1,317)
The Advisor | Other Fees
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	2,846	2,316	1,827
Due from (to) related party	(1,106)	(691)
The Advisor | Performance Participation Allocation
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	7,713	5,954	251
Due from (to) related party	(7,713)	(5,954)
Hines and Affiliates | Interest Expense
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	1,288	926	676
Due from (to) related party	(443)	(151)
Hines and Affiliates | Property Management Fees
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	1,866	1,093	858
Due from (to) related party	(287)	(78)
Hines and Affiliates | Construction Management Fees
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	413	472	236
Due from (to) related party	(30)	(28)
Hines and Affiliates | Leasing Fee
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	601	388	263
Due from (to) related party	(344)	(228)
Hines and Affiliates | Expense Reimbursements
Related Party Transactions
Related party transaction, fees and expense reimbursements incurred	4,506	2,168	$ 1,599
Due from (to) related party	$ (264)	$ (235)