Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Series A Convertible Redeemable Preferred Stock) (Details)

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Stockholders' Equity (Series A Convertible Redeemable Preferred Stock) (Details) - $ / shares
Sep. 16, 2013
Dec. 31, 2016
Jul. 07, 2016
Jun. 30, 2016
Class of Stock [Line Items]        
Redemption price (in dollars per share)     $ 5.20  
Series A Convertible Redeemable Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares) 100,000 100,000   100,000
Preferred stock, par value (in dollars per share) $ 1,000 $ 1,000   $ 1,000
Quarterly dividend rate (as a percent) 7.00%      
Redemption price (in dollars per share) $ 23      
Anniversary period (in months) 42 months      
Share price (in dollars per share) $ 1      
Voting percentage required to create, issue or amend preferred stock 51.00%      
Preferred stock, shares outstanding (in shares)   0   0
Series A Convertible Redeemable Preferred Stock | Maximum        
Class of Stock [Line Items]        
Percent of proceeds, which no convertible stock premium is due 33.00%      
Series A Convertible Redeemable Preferred Stock | Year One        
Class of Stock [Line Items]        
Conversion percentage 8.00%      
Series A Convertible Redeemable Preferred Stock | Year Two        
Class of Stock [Line Items]        
Conversion percentage 6.00%      
Series A Convertible Redeemable Preferred Stock | Year Three        
Class of Stock [Line Items]        
Conversion percentage 4.00%      
Series A Convertible Redeemable Preferred Stock | After Year Three, Before Forty Two Months        
Class of Stock [Line Items]        
Conversion percentage 2.00%      
Series A Convertible Redeemable Preferred Stock | After Forty Two Months        
Class of Stock [Line Items]        
Conversion percentage 0.00%