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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Sales: |  |  |  |  |  |
Product | $ 1,518,738 |  | $ 1,295,374 |  | $ 1,392,871 |
Installations and service | 223,058 |  | 202,214 |  | 198,439 |
Total sales | 1,741,796 |  | 1,497,588 |  | 1,591,310 |
Cost and expenses: |  |  |  |  |  |
Cost of product | 1,192,009 |  | 1,024,071 |  | 1,057,783 |
Cost of installations and service | 196,659 |  | 175,740 |  | 179,558 |
(Increase) decrease in fair value of derivative instruments | 6,775 |  | (8,549) |  | 2,567 |
Delivery and branch expenses | 250,210 |  | 217,376 |  | 250,762 |
Depreciation and amortization expenses | 17,303 |  | 16,395 |  | 17,884 |
General and administrative expenses | 18,356 |  | 18,689 |  | 20,709 |
Finance charge income | (5,521) |  | (4,393) |  | (4,814) |
Operating income | 66,005 |  | 58,259 |  | 66,861 |
Interest expense, net | (14,433) |  | (14,060) |  | (15,654) |
Amortization of debt issuance costs | (1,745) |  | (1,634) |  | (2,440) |
Loss on redemption of debt |  |  |  |  | (1,700) |
Income before income taxes | 49,827 |  | 42,565 |  | 47,067 |
Income tax expense | 19,921 |  | 16,576 |  | 22,723 |
Net income | 29,906 |  | 25,989 |  | 24,344 |
General Partner's interest in net income | 159 |  | 136 |  | 115 |
Limited Partners' interest in net income | $ 29,747 |  | $ 25,853 |  | $ 24,229 |
Basic and diluted income per Limited Partner Unit | $ 0.47 | [1] | $ 0.40 | [1] | $ 0.35 | [1]
Weighted average number of Limited Partner units outstanding: |  |  |  |  |  |
Basic and Diluted | 59,409 |  | 61,931 |  | 66,822 |
[1] | See Note 17 Earnings Per Limited Partner Units.

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