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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

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- Definition In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Weighted average number of general partnership units outstanding determined by relating the portion of time within a reporting period that general partnership units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration