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Changes in Capital Structure - Schedule of dividends paid (Details) - $ / shares
3 Months Ended 6 Months Ended
Jul. 20, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dividends Payable [Line Items]            
Dividends Per Common Share (in dollars per share)   $ 0.03 $ 0.03 $ 0.03 $ 0.06 $ 0.18
Subsequent Event            
Dividends Payable [Line Items]            
Common stock dividends declared (in usd per share) $ 0.03          
Common stock dividends proposed annual amount (in usd per share) $ 0.12