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Supplemental Financial Data (Unaudited) (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Selected Quarterly Financial Information                      
Total revenues $ 90,681,000 $ 103,164,000 $ 96,532,000 $ 84,852,000 $ 77,543,000 $ 80,752,000 $ 79,588,000 $ 63,519,000 $ 377,683,000 $ 301,401,000 $ 256,084,000
Depreciation, depletion and amortization 13,542,000 19,819,000 17,435,000 14,322,000         65,118,000 56,978,000 60,012,000
Income from operations (5,054,000) (17,796,000) 68,670,000 55,861,000 52,852,000 50,344,000 51,953,000 40,912,000 104,135,000 196,061,000 153,975,000
Net income (19,357,000) (30,559,000) 56,206,000 45,282,000 42,506,000 40,153,000 41,611,000 30,191,000 54,026,000 154,461,000 114,080,000
Basic and diluted net income per limited partner unit $ (0.18) $ (0.28) $ 0.52 $ 0.42 $ 0.39 $ 0.51 $ 0.38 $ 0.24 $ 0.50 $ 1.54 $ 1.17
Weighted average number of units outstanding 106,028 106,028 106,028 106,028 106,028 77,896 74,028 69,451 106,028 81,917 67,702
Selected Quarterly Financial Information (Textuals) [Abstract]                      
Asset impairments 70,400,000 90,900,000             161,336,000    
Asset impairment charges, per unit $ 0.65 $ 0.84                  
Deferred revenue, related to minimum royalties, recorded as revenue in a prior period                 4,000,000    
Deferred revenue, related to minimum royalties, recorded as revenue in a prior period, per unit                 $ 0.04    
Deferred revenue, related to a prior year, non-material, recorded as revenue in a prior period 2,500,000 800,000 700,000                
Deferred revenue, related to a prior year, non-material, recorded as revenue in a prior period, per unit $ 0.02                    
Increase (decrease) in Net Income   (2,100,000) 3,200,000                
Increase (decrease) in Net Income, per unit   $ (0.02) $ 0.03                
Increase (decrease) in Revenue   (600,000) 5,100,000                
Increase in Depletion Expense   700,000 1,300,000                
Increase (decrease) in Income (Loss) from Operations and Net income   $ (1,300,000) $ 3,900,000