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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Sales: |  |  |  |  |
Total sales |  | $ 283,100 | $ 232,155 | $ 1,260,535 | $ 1,284,163
Cost and expenses: |  |  |  |  |
(Increase) decrease in the fair value of derivative instruments | [1] | (4,714) | (3,279) | (30,333) | 1,974
Delivery and branch expenses |  | 74,871 | 72,756 | 256,500 | 254,945
Depreciation and amortization expenses |  | 8,568 | 8,447 | 24,793 | 26,586
General and administrative expenses |  | 6,209 | 6,954 | 18,770 | 18,882
Finance charge income |  | (1,079) | (1,217) | (2,284) | (3,251)
Operating income (loss) |  | (13,764) | 498 | 160,717 | 129,066
Interest expense, net |  | (1,957) | (2,308) | (5,944) | (7,743)
Amortization of debt issuance costs |  | (242) | (241) | (732) | (729)
Income (loss) before income taxes |  | (15,963) | (2,051) | 154,041 | 120,594
Income tax expense (benefit) |  | (3,909) | (2,005) | 43,071 | 34,477
Net income (loss) |  | (12,054) | (46) | 110,970 | 86,117
General Partner’s interest in net income (loss) |  | (98) | (1) | 879 | 600
Limited Partners’ interest in net income (loss) |  | $ (11,956) | $ (45) | $ 110,091 | $ 85,517
Basic and diluted income (loss) per Limited Partner Unit | [2] | $ (0.30) |  | $ 2.24 | $ 1.55
Weighted average number of Limited Partner units outstanding: |  |  |  |  |
Basic and Diluted |  | 40,041 | 45,246 | 40,897 | 46,253
Product |  |  |  |  |
Sales: |  |  |  |  |
Total sales |  | $ 205,045 | $ 165,182 | $ 1,044,748 | $ 1,079,145
Installations and services |  |  |  |  |
Sales: |  |  |  |  |
Total sales |  | 78,055 | 66,973 | 215,787 | 205,018
Cost of product |  |  |  |  |
Cost and expenses: |  |  |  |  |
Cost and expenses |  | 146,108 | 93,264 | 631,807 | 666,287
Cost of installations and services |  |  |  |  |
Cost and expenses: |  |  |  |  |
Cost and expenses |  | $ 66,901 | $ 54,732 | $ 200,565 | $ 189,674
[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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