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Equity - 8.375% Series B Cumulative Redeemable Preferred Stock Narrative (Details) (Series B Preferred Stock, USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Jan. 23, 2012
Public Offering
Dec. 31, 2010
Public Offering
Jan. 23, 2012
Public Offering, Exercise of Over-allotment Option
Dec. 31, 2010
Public Offering, Exercise of Over-allotment Option
Sep. 30, 2014
Change of Control
Class of Stock              
Interest rate of preferred stock 8.375% 8.375%         12.375%
Shares outstanding of preferred stock 5,800,000 5,800,000          
Series B Cumulative Redeemable Preferred Stock, Liquidation Preference Per Share $ 25.00 $ 25.00          
Par value of preferred stock $ 0.01 $ 0.01          
Proceeds from sale of common stock (in shares)     2,300,000 3,500,000 300,000 300,000  
Proceeds from the offering before transaction costs     $ 57.5 $ 83.9      
Liquidation preference of preferred stock, per annum (dollars per share) $ 2.0938           $ 3.09375
Preferred stock, redemption period after change in control 90 days