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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Sales: |  |  |  |  |
Product |  | $ 158,531 | $ 156,229 | $ 950,307 | $ 813,519
Installations and services |  | 67,270 | 61,965 | 191,664 | 185,755
Total sales |  | 225,801 | 218,194 | 1,141,971 | 999,274
Cost and expenses: |  |  |  |  |
Cost of product |  | 104,268 | 103,568 | 592,802 | 473,534
Cost of installations and services |  | 58,224 | 53,272 | 183,137 | 175,042
(Increase) decrease in fair value of derivative instruments | [1] | 3,135 | (11,283) | 7,026 | (20,071)
Delivery and branch expenses |  | 67,640 | 64,052 | 240,987 | 218,755
Depreciation and amortization expenses |  | 7,418 | 6,468 | 20,705 | 19,959
General and administrative expenses |  | 6,235 | 6,017 | 18,144 | 17,525
Finance charge income |  | (1,308) | (945) | (3,288) | (2,480)
Operating income (loss) |  | (19,811) | (2,955) | 82,458 | 117,010
Interest expense, net |  | (1,619) | (1,731) | (5,118) | (5,481)
Amortization of debt issuance costs |  | (336) | (307) | (972) | (934)
Income (loss) before income taxes |  | (21,766) | (4,993) | 76,368 | 110,595
Income tax expense (benefit) |  | (8,434) | (1,755) | 31,721 | 46,566
Net income (loss) |  | (13,332) | (3,238) | 44,647 | 64,029
General Partner's interest in net income (loss) |  | (79) | (19) | 259 | 362
Limited Partners' interest in net income (loss) |  | $ (13,253) | $ (3,219) | $ 44,388 | $ 63,667
Basic and diluted income (loss) per Limited Partner Unit | [2] | $ (0.24) | $ (0.06) | $ 0.70 | $ 0.95
Weighted average number of Limited Partner units outstanding: |  |  |  |  |
Basic and Diluted |  | 55,888 | 57,188 | 55,888 | 57,237
[1] | Represents the change in value of unrealized open positions and expired options.
[2] | See Note 13 Earnings Per Limited Partner Unit.

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