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Earnings per share, textuals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Unvested shares granted under the company's incentive plan 972,551   361,442 13,334
Dividends declared and paid during the period $ 369 $ 7,168