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Equity - 8.375% Series B Cumulative Redeemable Preferred Stock Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Apr. 10, 2015
Jan. 20, 2015
Jan. 23, 2012
Dec. 31, 2010
Jun. 30, 2015
Dec. 31, 2014
Class of Stock            
Proceeds from sale of common stock (in shares) 6,037,500 11,000,000        
Public Offering, Exercise of Over-allotment Option            
Class of Stock            
Proceeds from sale of common stock (in shares)   1,650,000        
Series B Preferred Stock            
Class of Stock            
Interest rate of preferred stock         8.375% 8.375%
Shares outstanding of preferred stock         5,800,000 5,800,000
Series B Cumulative Redeemable Preferred Stock, Liquidation Preference Per Share         $ 25 $ 25
Par value of preferred stock         0.01 $ 0.01
Liquidation preference of preferred stock, per annum (dollars per share)         $ 2.0938  
Preferred stock, redemption period after change in control         90 days  
Series B Preferred Stock | Change of Control            
Class of Stock            
Interest rate of preferred stock         12.375%  
Liquidation preference of preferred stock, per annum (dollars per share)         $ 3.09375  
Series B Preferred Stock | Public Offering            
Class of Stock            
Proceeds from sale of common stock (in shares)     2,300,000 3,500,000    
Proceeds from the offering before transaction costs     $ 57.5 $ 83.9    
Series B Preferred Stock | Public Offering, Exercise of Over-allotment Option            
Class of Stock            
Proceeds from sale of common stock (in shares)     300,000 300,000