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Selected Quarterly Financial Data | 12 Months Ended
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Sep. 30, 2014
Selected Quarterly Financial Data | 18) Selected Quarterly Financial Data (unaudited)
|  | Three Months Ended |  |  |  |
(in thousands - except per unit data) |  | Dec. 31, 2013 |  |  | Mar. 31, 2014 |  |  | Jun. 30, 2014 |  |  | Sep. 30, 2014 |  |  | Total |
Sales |  | $ | 520,610 |  |  | $ | 892,241 |  |  | $ | 326,511 |  |  | $ | 222,362 |  |  | $ | 1,961,724 |
Gross profit for product, installation and service |  |  | 108,590 |  |  |  | 199,645 |  |  |  | 60,682 |  |  |  | 37,507 |  |  |  | 406,424 |
Operating income (loss) |  |  | 36,887 |  |  |  | 93,953 |  |  |  | (10,797 | ) |  |  | (40,188 | ) |  |  | 79,855 |
Income (loss) before income taxes |  |  | 32,843 |  |  |  | 89,289 |  |  |  | (16,618 | ) |  |  | (44,115 | ) |  |  | 61,399 |
Net income (loss) |  |  | 19,288 |  |  |  | 52,216 |  |  |  | (9,592 | ) |  |  | (25,828 | ) |  |  | 36,084 |
Limited Partner interest in net income (loss) |  |  | 19,179 |  |  |  | 51,922 |  |  |  | (9,538 | ) |  |  | (25,682 | ) |  |  | 35,881 |
Net income (loss) per Limited Partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (a) |  | $ | 0.29 |  |  | $ | 0.75 |  |  | $ | (0.17 | ) |  | $ | (0.45 | ) |  | $ | 0.57 |
|  | Three Months Ended |  |  |  |
(in thousands - except per unit data) |  | Dec. 31, 2012 |  |  | Mar. 31, 2013 |  |  | Jun. 30, 2013 |  |  | Sep. 30, 2013 |  |  | Total |
Sales |  | $ | 516,525 |  |  | $ | 785,139 |  |  | $ | 262,524 |  |  | $ | 177,608 |  |  | $ | 1,741,796 |
Gross profit for product, installation and service |  |  | 102,691 |  |  |  | 162,011 |  |  |  | 54,907 |  |  |  | 33,519 |  |  |  | 353,128 |
Operating income (loss) |  |  | 18,577 |  |  |  | 75,229 |  |  |  | (8,001 | ) |  |  | (19,800 | ) |  |  | 66,005 |
Income (loss) before income taxes |  |  | 14,669 |  |  |  | 70,796 |  |  |  | (11,952 | ) |  |  | (23,686 | ) |  |  | 49,827 |
Net income (loss) |  |  | 9,752 |  |  |  | 41,679 |  |  |  | (7,588 | ) |  |  | (13,937 | ) |  |  | 29,906 |
Limited Partner interest in net income (loss) |  |  | 9,699 |  |  |  | 41,454 |  |  |  | (7,547 | ) |  |  | (13,859 | ) |  |  | 29,747 |
Net income (loss) per Limited Partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (a) |  | $ | 0.15 |  |  | $ | 0.58 |  |  | $ | (0.13 | ) |  | $ | (0.24 | ) |  | $ | 0.47 |
(a) | The sum of the quarters do not add-up to the total due to the weighting of Limited Partner Units outstanding, rounding or the theoretical effects of FASB ASC 260-10-45-60 to Master Limited Partners earnings per unit.

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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 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 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 FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=25249566&loc=d3e1280-108306 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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