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Related Party Transactions and Arrangements - Audrain Building (Details) - USD ($)
12 Months Ended
Oct. 04, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]        
Related-party revenues   $ 118,423,000 $ 110,809,000 $ 202,434,000
Affiliates of Former Manager [Member]        
Related Party Transaction [Line Items]        
Related party expenses       8,500,000
Affiliates of Former Manager [Member] | Audrain Building, Tenant Improvements and Furniture and Fixtures [Member]        
Related Party Transaction [Line Items]        
Related party expenses       8,700,000
Reimbursement of costs       8,500,000
Affiliates of Former Manager [Member] | Lease Agreement and Termination [Member]        
Related Party Transaction [Line Items]        
Lease term 15 years      
Annual base rent payment $ 400,000      
Fee paid to related party       300,000
Related-party revenues   0 0 17,000
Affiliates of Former Manager [Member] | Indirect Affiliate Expenses [Member]        
Related Party Transaction [Line Items]        
Related party expenses   $ 0 $ 0 $ 10,975,000
Affiliates of Former Manager [Member] | Indirect Affiliate Expenses [Member] | Member Units [Member]        
Related Party Transaction [Line Items]        
Reimbursement of costs, shares delivered and retired (shares)       916,423