Related Party Transactions - Adviser and Former Adviser Earned Fees and Incurred Reimbursable Expenses (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Asset management fees	$ 922		$ 3,099	$ 3,685	$ 6,289
Reimbursable expenses:
Operating expenses	1,233		1,489	2,362	2,846
Total fees earned and reimbursable expenses	2,155		4,588	6,047	9,135
Asset management fees included as discontinued operations			100		200
Due to affiliates						$ 475
General and Administrative Expenses
Reimbursable expenses:
Operating expenses		$ 1,100	$ 1,500		$ 2,800
Operating expenses
Reimbursable expenses:
Due to affiliates	$ 400			$ 400		$ 500