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Capital - Private Perpetual Preferred Units (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 9 Months Ended
Aug. 31, 2014
Sep. 30, 2014
Class of Stock [Line Items]    
Private Perpetual Preferred Units, Liquidation Preference Per Share $ 16.62  
Private Perpetual Preferred Units [Member]
    
Class of Stock [Line Items]    
Payments of Private Perpetual Preferred Units Distributions   $ 0.2
Private Perpetual Preferred Unit, Dividends, Per Unit, Declared   $ 0.15
Private Perpetual Preferred Units Issued During Period, Units, New Issues 1,609,813  
Private Perpetual Preferred Units, Liquidation Preference Per Share $ 16.62  
Private Perpetual Preferred Units, Dividend Rate, Per Unit $ 0.60  
Private Perpetual Preferred Unit, Offering Expense $ 1.4