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Supplemental Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2011
Supplemental Financial Data [Abstract] |
Supplemental Financial Data (Unaudited) | 17. Supplemental Financial Data (Unaudited) Shown below are selected unaudited quarterly data. Selected Quarterly Financial Information (In thousands, except per unit data)
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 |
During the Partnership’s third quarter and fourth quarters, asset impairment charges of $90.9 million, or $0.84 per unit, and $70.4 million, or $0.65 per unit, were recorded. During the preparation of the year-end financial statements, the Partnership determined that $4.0 million, or approximately $0.04 per unit, of deferred revenue related to minimum royalties for which the recoupment period had expired, should have been recorded as revenue in a prior period. Of the $4.0 million, $2.5 million, or $0.02 per unit, related to a prior year and was not material to the current or prior year and therefore was recorded as revenue in the fourth quarter. Of the remaining $1.5 million, $0.7 million and $0.8 million should have been recorded during the second and third quarters of 2011, respectively. The Partnership also determined that an exchange of coal reserves with Williamson Energy, a Cline Group affiliate, occurred during the second quarter but did not get recognized in the accounting records at that time. This exchange resulted in increased revenues and depletion expense in the second quarter, amounting to an increase in net income of $3.2 million, or $0.03 per unit. The exchange also resulted in decreased revenues and increased depletion expense in the third quarter, amounting to a decrease in net income of $2.1 million, or $0.02 per unit. The Partnership adjusted prior quarter amounts in the above table for 2011 by: increasing revenue by $5.1 million in the second quarter and decreasing revenue by $0.6 million in the third quarter; increasing depletion expense by $1.3 million and $0.7 million in the second and third quarters, respectively; and increasing income (loss) from operations and net income in the second quarter by $3.9 million and decreasing income(loss) from operations and net income in the third quarter by $1.3 million. These adjustments were all non-cash items and accordingly did not affect the cash flows of the Partnership.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 23, 24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 30 -Subparagraph a-j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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