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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Sales: |  |  |
Total sales |  | $ 535,027 | $ 436,834
Cost and expenses: |  |  |
(Increase) decrease in the fair value of derivative instruments | [1] | 31,039 | (11,400)
Delivery and branch expenses |  | 102,673 | 91,204
Depreciation and amortization expenses |  | 7,745 | 7,741
General and administrative expenses |  | 7,815 | 6,651
Finance charge income |  | (851) | (763)
Operating income |  | 6,063 | 31,066
Interest expense, net |  | (2,516) | (2,087)
Amortization of debt issuance costs |  | (259) | (309)
Income before income taxes |  | 3,288 | 28,670
Income tax expense (benefit) |  | 973 | (1,512)
Net income |  | 2,315 | 30,182
General Partner’s interest in net income |  | 15 | 175
Limited Partners’ interest in net income |  | $ 2,300 | $ 30,007
Basic and diluted income per Limited Partner Unit : | [2] | $ 0.04 | $ 0.45
Weighted average number of Limited Partner units outstanding: |  |  |
Basic and Diluted |  | 52,905 | 55,888
Product |  |  |
Sales: |  |  |
Total sales |  | $ 458,707 | $ 366,734
Installations and services |  |  |
Sales: |  |  |
Total sales |  | 76,320 | 70,100
Cost of product |  |  |
Cost and expenses: |  |  |
Cost and expenses |  | 306,226 | 242,780
Cost of installations and services |  |  |
Cost and expenses: |  |  |
Cost and expenses |  | $ 74,317 | $ 69,555
[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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