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Merger with Parkway Properties, Inc. (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Oct. 06, 2016
Oct. 05, 2016
Dec. 31, 2015
Business Combination, Separately Recognized Transactions [Line Items]                
Preferred Stock, Shares Issued   0   0       0
Document Period End Date       Sep. 30, 2016        
Acquisition Costs, Period Cost   $ 1,940 $ 19 $ 4,383 $ 104      
Subsequent Event [Member]                
Business Combination, Separately Recognized Transactions [Line Items]                
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 98.00%              
Share Price             $ 10.19  
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest 2.00%              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net           $ 1,900,000    
Preferred Stock, Shares Issued           7,000,000    
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 183,000,000              
Stockholders' Equity Note, Stock Split, Conversion Ratio           163.00%