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Related Party Transactions and Investments in Non-Consolidated Entities - Management fees and interest income from loans (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Management fees and interest income from loans      
Asset management fees, low end of range (as a percent) 1.00%    
Asset management fees, high end of range (as a percent) 5.00%    
Notice period for cancellation of applicable contracts 30 days    
Asset management fee income from non-consolidated entities $ 631,000 $ 701,000 $ 945,000