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Supplemental Financial Data (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2011
Supplemental Financial Data [Abstract]  
Selected Quarterly Financial Information
                                 

2011

  First
Quarter
    Second
Quarter
    Third
Quarter
    Fourth
Quarter
 
          (as restated)     (as restated)        

Total revenues

  $ 84,852     $ 96,532     $ 103,164     $ 90,681  

Depreciation, depletion and amortization

  $ 14,322     $ 17,435     $ 19,819     $ 13,542  

Income (loss) from operations

  $ 55,861     $ 68,670     $ (17,796   $ (5,054

Net income (loss)

  $ 45,282     $ 56,206     $ (30,559   $ (19,357

Basic and diluted net income (loss) per limited partner unit

  $ 0.42     $ 0.52     $ (0.28   $ (0.18

Weighted average number of units outstanding:

                               

Common

    106,028       106,028       106,028       106,028  

 

                                 

2010

  First
Quarter
    Second
Quarter
    Third
Quarter
    Fourth
Quarter
 

Total revenues

  $ 63,519     $ 79,588     $ 80,752     $ 77,543  

Income from operations

  $ 40,912     $ 51,953     $ 50,344     $ 52,852  

Net income

  $ 30,191     $ 41,611     $ 40,153     $ 42,506  

Basic and diluted net income per limited partner unit

  $ 0.24     $ 0.38     $ 0.51     $ 0.39  

Weighted average number of units outstanding:

                               

Common

    69,451       74,028       77,896       106,028