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Supplemental Quarterly Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Information | The following table summarizes quarterly financial data for 2015 and 2014 (in thousands, except per unit data):
2015 | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |  |  | Total 2015
Total revenues and other income | $ | 109,677 |  |  |  | $ | 137,630 |  |  |  | $ | 125,479 |  |  |  | $ | 116,063 |  |  |  | $ | 488,849 |
Depreciation, depletion and amortization | $ | 25,392 |  |  |  | $ | 30,660 |  |  |  | $ | 26,624 |  |  |  | $ | 18,152 |  |  |  | $ | 100,828 |
Asset impairment | $ | — |  |  |  | $ | 3,803 |  | (1) |  | $ | 626,838 |  | (2) |  | $ | 50,953 |  | (3) |  | $ | 681,594 |
Income (loss) from operations | $ | 40,417 |  |  |  | $ | 55,920 |  |  |  | $ | (576,290 | ) |  |  | $ | 2,042 |  |  |  | $ | (477,911 | )
Net income (loss) | $ | 17,489 |  |  |  | $ | 32,578 |  |  |  | $ | (600,001 | ) |  |  | $ | (21,786 | ) |  |  | $ | (571,720 | )
Net income (loss) per limited partner unit | $ | 1.40 |  |  |  | $ | 2.50 |  |  |  | $ | (47.90 | ) |  |  | $ | (1.75 | ) |  |  | $ | (45.75 | )
Weighted average number of common units outstanding | 12,230 |  |  |  | 12,230 |  |  |  | 12,230 |  |  |  | 12,230 |  |  |  | 12,230 |
2014 | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |  |  | Total 2014
Total revenues and other income | $ | 80,309 |  |  |  | $ | 90,561 |  |  |  | $ | 91,609 |  |  |  | $ | 137,273 |  |  |  | $ | 399,752 |
Depreciation, depletion and amortization | $ | 14,647 |  |  |  | $ | 16,350 |  |  |  | $ | 18,621 |  |  |  | $ | 30,258 |  |  |  | $ | 79,876 |
Asset impairment | $ | — |  |  |  | $ | 5,624 |  | (4) |  | $ | — |  |  |  | $ | 20,585 |  | (5) |  | 26,209 |
Income from operations | $ | 52,439 |  |  |  | $ | 50,403 |  |  |  | $ | 55,027 |  |  |  | $ | 31,050 |  |  |  | $ | 188,919 |
Net income | $ | 32,605 |  |  |  | $ | 31,407 |  |  |  | $ | 36,173 |  |  |  | $ | 8,645 |  |  |  | $ | 108,830 |
Net income per limited partner unit | $ | 2.90 |  |  |  | $ | 2.80 |  |  |  | $ | 3.20 |  |  |  | $ | 0.70 |  |  |  | $ | 9.42 |
Weighted average number of common units outstanding | 10,985 |  |  |  | 11,040 |  |  |  | 11,124 |  |  |  | 12,145 |  |  |  | 11,326 |
(1) | During the second quarter of 2015 we recorded a $2.3 million impairment expense related to a coal preparation plant and a $1.5 million impairment expense related to coal mineral rights.
(2) | During the third quarter of 2015 we recorded $335.7 million of oil and gas property impairment, $247.8 million of coal property impairment and $43.4 million of aggregates property impairment.
(3) | During the fourth quarter of 2015 we recorded $31.9 million of oil and gas property impairment, $8.2 million of coal property impairment, $5.5 million of goodwill impairment, $4.7 million related to coal processing and transportation assets as well as obsolete equipment at our Logan office as well as a $0.7 million impairment expense related to obsolete plant and equipment at VantaCore.
(4) | During the second quarter of 2014, we recorded $5.6 million of intangible asset impairment related to an aggregates lease.
(5) | During the fourth quarter of 2014, we recorded $16.8 million of coal property impairment and $3.0 million of aggregates property impairment as well as $0.8 million in impairment expense related to a coal preparation plant. that began with current realized pricing as of the measurement date and included an adjustment for risk related to the future realization of cash flows.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: 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=51825399&loc=d3e1280-108306 + Details
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