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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenues:    
Coal royalties $ 59,916 $ 65,365
Aggregate royalties 1,716 1,194
Processing fees 2,126 3,089
Transportation fees 4,108 4,098
Oil and gas royalties 1,388 2,992
Property taxes 4,488 3,012
Minimums recognized as revenue 11,714 507
Override royalties 5,142 3,043
Other 1,274 1,552
Total revenues 91,872 84,852
Operating costs and expenses:    
Depreciation, depletion and amortization 12,409 14,322
General and administrative 8,950 10,196
Property, franchise and other taxes 5,016 3,697
Transportation costs 473 468
Coal royalty and override payments 200 308
Total operating costs and expenses 27,048 28,991
Income from operations 64,824 55,861
Other income (expense):    
Interest expense (13,560) (10,587)
Interest income 45 8
Income before non-controlling interest 51,309 45,282
Less non-controlling interest      
Net income 51,309 45,282
Net income attributable to:    
General partner 1,026 906
Limited partners 50,283 44,376
Basic and diluted net income per limited partner unit $ 0.47 $ 0.42
Weighted average number of units outstanding 106,028 106,028
Comprehensive income $ 51,319 $ 45,294