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Incentive Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Incentive Compensation Plans  
Summary of share-based compensation plans

 

Share-based compensation plan
Award
Classification		 Further awards
authorized for
issuance under
plan as of
December 31,
2013		 Awards
outstanding
under the
plan as of
December 31,
2013		 Final Year
of Activity

2008 Long-Term Incentive Plan ("2008 LTIP")

 Equity Yes Yes N/A

Long-Term Incentive Plan ("2002 LTIP")

 Liability No No 2011
Schedule of compensation expense recorded for share-based pay arrangements

Total compensation expense recorded for share-based pay arrangements was as follows (in thousands):

 
   Year ended December 31,  
 
   2013   2012   2011  

Phantom units

   $ 16,282   $ 14,615   $ 13,479  

Distribution equivalent rights(1)

     77     41     446  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total compensation expense

   $ 16,359   $ 14,656   $ 13,925  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
(1)
A distribution equivalent right is a right, granted in tandem with a specific phantom unit, to receive an amount in cash equal to and at the same time as, the cash distributions made by the Partnership with respect to a unit during the period such phantom unit is outstanding. Payment of distribution equivalent rights associated with units that are expected to vest are recorded as capital distributions, however, payments associated with units that are not expected to vest are recorded as compensation expense.
2008 LTIP
  
Incentive Compensation Plans  
Phantom unit activity

 

 

 
   Number of
Units		   Weighted-
average
Grant-date
Fair Value		  

Unvested at December 31, 2012

     687,576   $ 45.79  

Granted

     342,489     57.48  

Vested

     (260,113 )   38.78  

Forfeited

     (12,443 )   53.38  
             
​ ​ ​ ​ ​ ​ ​ ​

Unvested at December 31, 2013

     757,509     53.36  
             
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​