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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues:      
Coal royalties $ 279,221 $ 221,761 $ 196,621
Aggregate royalties 6,734 4,230 5,580
Processing fees 13,475 9,604 7,673
Transportation fees 16,688 14,564 12,517
Oil and gas royalties 14,017 7,720 7,520
Property taxes 12,640 11,270 11,636
Minimums recognized as revenue 9,148 14,199 1,266
Override royalties 14,523 11,258 9,251
Other 11,237 6,795 4,020
Total revenues 377,683 301,401 256,084
Operating costs and expenses:      
Depreciation, depletion and amortization 65,118 56,978 60,012
Asset impairments 161,336    
General and administrative 29,553 29,893 23,102
Property, franchise and other taxes 14,486 15,107 14,996
Transportation costs 2,033 1,864 1,611
Coal royalty and override payments 1,022 1,498 2,388
Total operating costs and expenses 273,548 105,340 102,109
Income from operations 104,135 196,061 153,975
Other income (expense)      
Interest expense (49,180) (41,635) (40,108)
Interest income 69 35 213
Income before non-controlling interest 55,024 154,461 114,080
Non-controlling interest (998) (5,065)  
Net income 54,026 154,461 114,080
Net income attributable to:      
General partner 1,081 2,570 1,611
Holders of incentive distribution rights   25,966 33,515
Limited partners $ 50,945 $ 125,925 $ 78,954
Basic and diluted net income per limited partner unit $ 0.50 $ 1.54 $ 1.17
Weighted average number of units outstanding 106,028 81,917 67,702