Related Party Transactions and Arrangements (Fees Paid in Connection With the Operations of the Company, Incurred, Forgiven and Payable) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Expenses incurred	$ 33,831	$ 32,470	$ 30,477
Payable (receivable)	(394)	610
Reduction of general and administrative expense	(20,530)	(17,275)	(15,673)
Acquisition cost reimbursements
Related Party Transaction [Line Items]
Expenses incurred	39	176	124
Payable (receivable)	0	32
Financing coordination fees
Related Party Transaction [Line Items]
Expenses incurred	0	0	0
Payable (receivable)	0	0
Due to (from) HT III related to asset purchase
Related Party Transaction [Line Items]
Expenses incurred	0	0	0
Payable (receivable)	0	(154)
Asset management fees
Related Party Transaction [Line Items]
Expenses incurred	19,526	19,500	19,189
Payable (receivable)	27	0
Property management fees
Related Party Transaction [Line Items]
Expenses incurred	3,888	3,571	3,068
Payable (receivable)	(44)	58
Transfer agent and other professional services
Related Party Transaction [Line Items]
Expenses incurred	10,073	8,883	7,553
Payable (receivable)	(377)	674
Reduction of general and administrative expense	500
Distributions on Class B Units
Related Party Transaction [Line Items]
Expenses incurred	305	340	$ 543
Payable (receivable)	$ 0	$ 0
Advisor
Related Party Transaction [Line Items]
Shares approved for issuance (in shares)	359,250
Advisor \| Professional Fees and Reimbursements
Related Party Transaction [Line Items]
Due from Affiliates	$ 500
Capped Reimbursement Amount
Related Party Transaction [Line Items]
Reimbursed fees to related party, capped reimbursement amount	$ 7,200

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