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Stock based payments and director fees (Details) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares 31,530 59,365
Amount of expense recognized [1] $ 466 $ 864
Management fee    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares 29,790 55,877
Amount of expense recognized [1] $ 441 $ 814
Independent director fees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares 1,740 3,488
Amount of expense recognized [1] $ 25 $ 50
[1] All management fees and independent director fees are fully expensed in the period in which they are incurred.