Related Party Transactions (Details) - Property Manager - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Accounts payable - affiliates	$ 1,628		$ 1,628		$ 1,808
Property Manager
Related Party Transaction [Line Items]
Expenses from transactions with related party	3,886	$ 3,581	7,560	$ 6,489
Accounts payable - affiliates	1,532		$ 1,532		1,533
Property Manager | Property Management Fees
Related Party Transaction [Line Items]
Property management fee, percent fee			4.00%
Expenses from transactions with related party	1,733	1,492	$ 3,431	2,892
Accounts payable - affiliates	555		$ 555		580
Property Manager | Leasing Commissions
Related Party Transaction [Line Items]
Allowed percentage increase to leasing fee payable			50.00%
Expenses from transactions with related party	1,405	985	$ 2,669	1,621
Accounts payable - affiliates	363		363		202
Property Manager | Construction Management Fees
Related Party Transaction [Line Items]
Expenses from transactions with related party	127	143	202	221
Accounts payable - affiliates	51		51		260
Property Manager | Other Fees and Reimbursements
Related Party Transaction [Line Items]
Expenses from transactions with related party	621	$ 961	1,258	$ 1,755
Accounts payable - affiliates	$ 563		$ 563		$ 491