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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Sales: |  |  |  |  |
Product |  | $ 622,962 | $ 475,485 | $ 989,696 | $ 791,776
Installations and services |  | 61,069 | 56,567 | 131,169 | 124,394
Total sales |  | 684,031 | 532,052 | 1,120,865 | 916,170
Cost and expenses: |  |  |  |  |
Cost of product |  | 403,293 | 288,941 | 646,073 | 488,534
Cost of installations and services |  | 64,659 | 58,426 | 134,214 | 124,913
(Increase) decrease in the fair value of derivative instruments | [1] | 11,609 | 12,442 | 209 | 3,891
Delivery and branch expenses |  | 106,605 | 92,214 | 197,809 | 173,347
Depreciation and amortization expenses |  | 7,703 | 6,726 | 15,444 | 13,287
General and administrative expenses |  | 6,221 | 5,556 | 12,872 | 11,909
Finance charge income |  | (1,532) | (1,285) | (2,295) | (1,980)
Operating income |  | 85,473 | 69,032 | 116,539 | 102,269
Interest expense, net |  | (2,383) | (1,712) | (4,470) | (3,499)
Amortization of debt issuance costs |  | (307) | (324) | (616) | (636)
Income before income taxes |  | 82,783 | 66,996 | 111,453 | 98,134
Income tax expense |  | 28,005 | 27,292 | 26,493 | 40,155
Net income |  | 54,778 | 39,704 | 84,960 | 57,979
General Partner’s interest in net income |  | 319 | 233 | 494 | 338
Limited Partners’ interest in net income |  | $ 54,459 | $ 39,471 | $ 84,466 | $ 57,641
Basic and diluted income per Limited Partner Unit | [2] | $ 0.81 | $ 0.59 | $ 1.26 | $ 0.87
Weighted average number of Limited Partner units outstanding: |  |  |  |  |
Basic and Diluted |  | 55,642 | 55,888 | 55,766 | 55,888
[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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