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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Sales: |  |  |
Product |  | $ 366,734 | $ 316,291
Installations and services |  | 70,100 | 67,827
Total sales |  | 436,834 | 384,118
Cost and expenses: |  |  |
Cost of product |  | 242,780 | 199,593
Cost of installations and services |  | 69,555 | 66,487
(Increase) decrease in the fair value of derivative instruments | [1] | (11,400) | (8,551)
Delivery and branch expenses |  | 91,204 | 81,133
Depreciation and amortization expenses |  | 7,741 | 6,561
General and administrative expenses |  | 6,651 | 6,353
Finance charge income |  | (763) | (695)
Operating income |  | 31,066 | 33,237
Interest expense, net |  | (2,087) | (1,787)
Amortization of debt issuance costs |  | (309) | (312)
Income before income taxes |  | 28,670 | 31,138
Income tax (benefit) expense |  | (1,512) | 12,863
Net income |  | 30,182 | 18,275
General Partner’s interest in net income |  | 175 | 105
Limited Partners’ interest in net income |  | $ 30,007 | $ 18,170
Basic and diluted income per Limited Partner Unit | [2] | $ 0.45 | $ 0.28
Weighted average number of Limited Partner units outstanding: |  |  |
Basic and Diluted |  | 55,887 | 55,887
[1] | Represents the change in value of unrealized open positions and expired options.
[2] | See Note 13 - Earnings Per Limited Partner Unit.

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