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Stock based payments and director fees (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares 17,356 31,530 33,920 59,365
Amount of expense recognized [1] $ 259 $ 436 $ 514 $ 864
Management fees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares 15,684 29,790 30,600 55,877
Amount of expense recognized [1] $ 234 $ 411 $ 462 $ 814
Independent director fees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares 1,672 1,740 3,320 3,488
Amount of expense recognized [1] $ 25 $ 25 $ 52 $ 50
[1] All management fees and independent director fees are fully expensed in the period in which they are incurred.