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Related Party Transactions - Related Party Transaction Revenue and Expenses Included in Statements of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Related Party Transaction [Line Items]        
Management fees $ 2,724 $ 1,780    
MSA reimbursement 2,578 2,098    
MSA costs $ (3,663) $ (3,576) $ (7,731) $ (7,002)
Other Revenue [Member]        
Related Party Transaction [Line Items]        
Management fees     4,780 4,004
General and Administrative Expense [Member]        
Related Party Transaction [Line Items]        
MSA reimbursement     4,809 3,889
Related Party, General And Administrative Expense [Member]        
Related Party Transaction [Line Items]        
MSA costs     $ (7,731) $ (7,002)