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Unconsolidated affiliates (Details Textuals) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 05, 2014
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Unconsolidated Affiliates [Line Items]        
Ownership percentage   40.50% 40.50%  
Total assets   $ 501,838 $ 501,838 $ 272,758
Total liabilities   273,388 273,388 101,478
Net income   $ 5,436 $ 9,076  
Thetis Asset Management LLC        
Unconsolidated Affiliates [Line Items]        
Ownership percentage   19.80% 19.80%  
Total assets   $ 2,800 $ 2,800 2,200
Total liabilities   300 300 200
Net income   $ 300 $ 500  
Delaware Trust GA-E 2014-12        
Unconsolidated Affiliates [Line Items]        
Ownership percentage 40.50% 40.50% 40.50%  
Acquiring interest amount $ 2,200      
Loan amount   $ 5,600 $ 5,600 $ 5,400
Net income   $ 200 $ 400