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Partners' Capital - Incentive Distribution Rights (Details) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Limited partner | Incentive Distribution Rights | Minimum Quarterly Distribution
    
Partners' Capital    
Marginal percentage interest in distributions 98.30%  
Limited partner | Incentive Distribution Rights | First Target Distribution
    
Partners' Capital    
Marginal percentage interest in distributions 98.30%  
Limited partner | Incentive Distribution Rights | Second Target Distribution
    
Partners' Capital    
Marginal percentage interest in distributions 85.30%  
Limited partner | Incentive Distribution Rights | Third Target Distribution
    
Partners' Capital    
Marginal percentage interest in distributions 75.30%  
Limited partner | Incentive Distribution Rights | Thereafter
    
Partners' Capital    
Marginal percentage interest in distributions 50.30%  
General partner
    
Partners' Capital    
General Partner, interest (as a percent) 1.70% 2.00%
General partner | Incentive Distribution Rights | Minimum Quarterly Distribution
    
Partners' Capital    
Quarterly distribution per unit (in dollars per share) $ 0.425  
Marginal percentage interest in distributions 1.70%  
General partner | Incentive Distribution Rights | First Target Distribution
    
Partners' Capital    
Marginal percentage interest in distributions 1.70%  
General partner | Incentive Distribution Rights | First Target Distribution | Maximum
    
Partners' Capital    
Quarterly distribution per unit (in dollars per share) $ 0.4888  
General partner | Incentive Distribution Rights | Second Target Distribution
    
Partners' Capital    
Marginal percentage interest in distributions 14.70%  
General partner | Incentive Distribution Rights | Second Target Distribution | Minimum
    
Partners' Capital    
Quarterly distribution per unit (in dollars per share) $ 0.4888  
General partner | Incentive Distribution Rights | Second Target Distribution | Maximum
    
Partners' Capital    
Quarterly distribution per unit (in dollars per share) $ 0.5313  
General partner | Incentive Distribution Rights | Third Target Distribution
    
Partners' Capital    
Marginal percentage interest in distributions 24.70%  
General partner | Incentive Distribution Rights | Third Target Distribution | Minimum
    
Partners' Capital    
Quarterly distribution per unit (in dollars per share) $ 0.5313  
General partner | Incentive Distribution Rights | Third Target Distribution | Maximum
    
Partners' Capital    
Quarterly distribution per unit (in dollars per share) $ 0.6375  
General partner | Incentive Distribution Rights | Thereafter
    
Partners' Capital    
Marginal percentage interest in distributions 49.70%  
General partner | Incentive Distribution Rights | Thereafter | Minimum
    
Partners' Capital    
Quarterly distribution per unit (in dollars per share) $ 0.6375