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Preferred Shares and Tender Offer (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
May. 17, 2015
Dec. 31, 2014
Max Reimbursement to Acquiror   $ 500,000    
Preferred Stock, Liquidation Preference, Value $ 1,000 1,000    
Payments of Stock Issuance Costs   2,900,000    
Payments of Stock Issuance Costs   $ 2,700,000    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01 $ 0.01
merger termination fee $ 20,000,000      
Preferred Stock [Member]        
Sale of Stock, Value of Shares Authorized for Transaction $ 150,000,000 $ 150,000,000    
Convertible Preferred Stock, Conversion Price $ 5.00 $ 5.00 $ 5.05