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Long-Term Incentive Plan (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 59 Months Ended
Jun. 27, 2013
Mar. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 22, 2012
Long-Term Incentive Plan          
Number of common units initially authorized for issuance under LTIP (in shares)   564,242 564,242    
Number of common units available for issuance         4,300,000
Long-Term Incentive Plan          
Phantom units granted (in shares) 498,112        
Compensation expenses for phantom unit awards   $ 0.8      
Repurchase Program          
Aggregate common units authorized to be acquired (in shares)   742,427 742,427    
Common units repurchased by General Partner (in shares)     495,414    
Common units repurchased by General Partner   0 12.2    
Repurchased units not deemed outstanding   169,816 169,816 169,816  
Phantom Unit Awards
         
Long-Term Incentive Plan          
Compensation cost related to the non-vested awards not yet recognized   $ 17.0 $ 17.0    
All employees except one employee | July 1, 2017
         
Long-Term Incentive Plan          
Vesting rights percentage of phantom units   33.33%      
All employees except one employee | July 1, 2018
         
Long-Term Incentive Plan          
Cumulative vesting rights percentage on the second vesting of phantom units   66.67%      
All employees except one employee | July 1, 2019
         
Long-Term Incentive Plan          
Cumulative vesting rights percentage on the third vesting of phantom units   100.00%      
One employee | December 31, 2014
         
Long-Term Incentive Plan          
Vesting rights percentage of phantom units   33.33%      
One employee | December 31, 2015
         
Long-Term Incentive Plan          
Cumulative vesting rights percentage on the second vesting of phantom units   66.67%      
One employee | December 31, 2016
         
Long-Term Incentive Plan          
Cumulative vesting rights percentage on the third vesting of phantom units   100.00%      
Non-employee directors | December 31, 2014
         
Long-Term Incentive Plan          
Vesting rights percentage of phantom units   33.33%      
Non-employee directors | December 31, 2015
         
Long-Term Incentive Plan          
Cumulative vesting rights percentage on the second vesting of phantom units   66.67%      
Non-employee directors | December 31, 2016
         
Long-Term Incentive Plan          
Cumulative vesting rights percentage on the third vesting of phantom units   100.00%