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Equity-Based Compensation (Phantom Common Unit Awards) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   (7,834)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   $ 19.12  
Phantom common units [Member] | 2012 Long Term Incentive Plan [Member]
     
Nonvested, Number of Shares [Roll Forward]      
Non-vested at beginning of the period, Shares   32,500 0
Granted, shares 3,674 15,813 32,500
Non-vested at end of period, Shares 40,479 40,479 32,500
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Non-vested at beginning of the period, Weighted Average Grant Date Fair Value   $ 18.93 $ 0
Granted, Weighted Average Grant Date Fair Value   $ 27.15 $ 18.93
Non-vested at end of period, Weighted Average Grant Date Fair Value $ 22.10 $ 22.10 $ 18.93
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 0.9 $ 0.9  
Phantom common units [Member] | Non-employee director [Member] | 2012 Long Term Incentive Plan [Member] | Minimum [Member]
     
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year  
Phantom common units [Member] | Non-employee director [Member] | 2012 Long Term Incentive Plan [Member] | Maximum [Member]
     
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years  
Phantom common units [Member] | Employee [Member] | 2012 Long Term Incentive Plan [Member] | Minimum [Member]
     
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   2 years  
Phantom common units [Member] | Employee [Member] | 2012 Long Term Incentive Plan [Member] | Maximum [Member]
     
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years