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Equity Incentive Plans - Summary of non-vested restricted shares (Table) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of shares      
Unvested at beginning of period 280,000 385,000 135,230
Granted 672,500 944,000 1,035,000
Cancelled     (1,685)
Vested (809,500) (1,049,000) (783,545)
Unvested at end of period 143,000 280,000 385,000
Weighted Average Grant Date Fair Value      
Unvested at beginning of period $ 8.09 $ 4.82 $ 17.75
Granted 11.68 9.59 4.15
Cancelled     17.75
Vested 10.29 8.24 6.14
Unvested at end of period $ 12.49 $ 8.09 $ 4.82