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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Sales: |  |  |  |  |
Total sales |  | $ 283,376 | $ 327,354 | $ 1,517,985 | $ 1,448,219
Cost and expenses: |  |  |  |  |
(Increase) decrease in the fair value of derivative instruments | [1] | 1,630 | (7,515) | 19,268 | (7,306)
Delivery and branch expenses |  | 82,669 | 83,312 | 296,026 | 281,121
Depreciation and amortization expenses |  | 8,225 | 7,941 | 23,828 | 23,385
General and administrative expenses |  | 5,472 | 5,894 | 23,136 | 18,766
Finance charge income |  | (1,872) | (1,438) | (4,166) | (3,733)
Operating income (loss) |  | (29,933) | (8,817) | 81,132 | 107,722
Interest expense, net |  | (2,967) | (2,186) | (8,677) | (6,656)
Amortization of debt issuance costs |  | (253) | (418) | (756) | (1,034)
Income (loss) before income taxes |  | (33,153) | (11,421) | 71,699 | 100,032
Income tax expense (benefit) |  | (10,055) | (3,416) | 20,157 | 23,077
Net income (loss) |  | (23,098) | (8,005) | 51,542 | 76,955
General Partner’s interest in net income (loss) |  | (150) | (49) | 319 | 445
Limited Partners’ interest in net income (loss) |  | $ (22,948) | $ (7,956) | $ 51,223 | $ 76,510
Basic and diluted income (loss) per Limited Partner Unit : | [2] | $ (0.46) | $ (0.15) | $ 0.86 | $ 1.18
Weighted average number of Limited Partner units outstanding: |  |  |  |  |
Basic and Diluted |  | 49,943 | 53,938 | 51,431 | 55,157
Product |  |  |  |  |
Sales: |  |  |  |  |
Total sales |  | $ 210,657 | $ 256,447 | $ 1,306,764 | $ 1,246,143
Installations and services |  |  |  |  |
Sales: |  |  |  |  |
Total sales |  | 72,719 | 70,907 | 211,221 | 202,076
Cost of product |  |  |  |  |
Cost and expenses: |  |  |  |  |
Cost and expenses |  | 155,055 | 186,207 | 876,920 | 832,280
Cost of installations and services |  |  |  |  |
Cost and expenses: |  |  |  |  |
Cost and expenses |  | $ 62,130 | $ 61,770 | $ 201,841 | $ 195,984
[1] | Represents the change in value of unrealized open positions and expired options.
[2] | See Note 15 - Earnings Per Limited Partner Unit.

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