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Equity Investments (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Nov. 28, 2016
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]        
Equity method investments   $ 11,890   $ 12,162
Equity in losses of investees   222 $ 0  
Tremont Mortgage Trust        
Schedule of Equity Method Investments [Line Items]        
Equity method investments   136    
Equity in losses of investees   $ 21    
Tremont Realty Capital LLC | General Partner        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage acquired 0.50%      
Tremont Advisors | Tremont Mortgage Trust        
Schedule of Equity Method Investments [Line Items]        
Number of shares owned (in shares)   600,100    
Equity method investment ownership percentage   19.20%    
Equity method investments   $ 11,754    
Quoted market value   $ 8,815    
Quoted market value (in dollars per share)   $ 14.69    
Equity in losses of investees   $ 201