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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Sales: |  |  |  |  |  |
Total sales |  | $ 1,677,837 |  | $ 1,323,555 |  | $ 1,161,338
Cost and expenses: |  |  |  |  |  |
(Increase) decrease in the fair value of derivative instruments | [1] | (11,408) |  | (2,193) |  | (18,217)
Delivery and branch expenses |  | 357,580 |  | 306,534 |  | 276,493
Depreciation and amortization expenses |  | 31,575 |  | 27,882 |  | 26,530
General and administrative expenses |  | 24,227 |  | 24,998 |  | 23,366
Finance charge income |  | (4,700) |  | (4,054) |  | (3,079)
Operating income |  | 66,068 |  | 55,332 |  | 87,404
Interest expense, net |  | (8,716) |  | (6,775) |  | (7,485)
Amortization of debt issuance costs |  | (1,288) |  | (1,281) |  | (1,247)
Other income, net | [2] | 7,043 |  |  |  |
Income before income taxes |  | 63,107 |  | 47,276 |  | 78,672
Income tax expense |  | 7,602 |  | 20,376 |  | 33,738
Net income |  | 55,505 |  | 26,900 |  | 44,934
General Partner’s interest in net income |  | 314 |  | 156 |  | 252
Limited Partners’ interest in net income |  | $ 55,191 |  | $ 26,744 |  | $ 44,682
Basic and diluted income per Limited Partner Unit : | [3] | $ 0.89 | [4] | $ 0.46 | [4] | $ 0.70
Weighted average number of Limited Partner units outstanding: |  |  |  |  |  |
Basic and Diluted |  | 54,764 |  | 55,888 |  | 57,022
Product |  |  |  |  |  |
Sales: |  |  |  |  |  |
Total sales |  | $ 1,404,370 |  | $ 1,065,076 |  | $ 911,014
Installations and services |  |  |  |  |  |
Sales: |  |  |  |  |  |
Total sales |  | 273,467 |  | 258,479 |  | 250,324
Cost of product |  |  |  |  |  |
Cost and expenses: |  |  |  |  |  |
Cost and expenses |  | 957,843 |  | 675,386 |  | 539,831
Cost of installations and services |  |  |  |  |  |
Cost and expenses: |  |  |  |  |  |
Cost and expenses |  | $ 256,652 |  | $ 239,670 |  | $ 229,010
[1] | Represents the change in value of unrealized open positions and expired options.
[2] | See Note 2 - Other income, net.
[3] | See Note 18 - Earnings Per Limited Partner Units.
[4] | 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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