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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Sales: |  |  |  |  |
Total sales |  | $ 604,115 | $ 543,063 | $ 977,435 | $ 1,052,008
Cost and expenses: |  |  |  |  |
(Increase) decrease in the fair value of derivative instruments | [1] | (8,224) | 11,670 | (25,619) | 5,253
Delivery and branch expenses |  | 100,942 | 85,463 | 181,629 | 182,189
Depreciation and amortization expenses |  | 8,268 | 9,089 | 16,225 | 18,139
General and administrative expenses |  | 6,320 | 5,422 | 12,561 | 11,928
Finance charge income |  | (799) | (1,321) | (1,205) | (2,034)
Operating income |  | 119,695 | 86,117 | 174,481 | 128,568
Interest expense, net |  | (2,136) | (2,756) | (3,987) | (5,435)
Amortization of debt issuance costs |  | (243) | (253) | (490) | (488)
Income before income taxes |  | 117,316 | 83,108 | 170,004 | 122,645
Income tax expense |  | 32,152 | 24,700 | 46,980 | 36,482
Net income |  | 85,164 | 58,408 | 123,024 | 86,163
General Partner’s interest in net income |  | 681 | 409 | 977 | 601
Limited Partners’ interest in net income |  | $ 84,483 | $ 57,999 | $ 122,047 | $ 85,562
Basic and diluted income per Limited Partner Unit: | [2] | $ 1.71 | $ 1.03 | $ 2.43 | $ 1.52
Weighted average number of Limited Partner units outstanding: |  |  |  |  |
Basic and Diluted |  | 40,382 | 46,244 | 41,324 | 46,760
Product |  |  |  |  |
Sales: |  |  |  |  |
Total sales |  | $ 539,371 | $ 481,275 | $ 839,703 | $ 913,963
Installations and services |  |  |  |  |
Sales: |  |  |  |  |
Total sales |  | 64,744 | 61,788 | 137,732 | 138,045
Cost of product |  |  |  |  |
Cost and expenses: |  |  |  |  |
Cost and expenses |  | 313,552 | 285,350 | 485,699 | 573,023
Cost of installations and services |  |  |  |  |
Cost and expenses: |  |  |  |  |
Cost and expenses |  | $ 64,361 | $ 61,273 | $ 133,664 | $ 134,942
[1] | Represents the change in value of unrealized open positions and expired options.
[2] | See Note 16 - Earnings Per Limited Partner Unit.

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