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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sales:        
Product $ 404,340 $ 706,004 $ 657,290 $ 1,141,016
Installations and services 57,685 56,305 123,790 120,510
Total sales 462,025 762,309 781,080 1,261,526
Cost and expenses:        
Cost of product 219,864 462,815 369,966 772,064
Cost of installations and services 58,858 60,362 121,770 121,045
(Increase) decrease in fair value of derivative instruments (14,324) (12,631) (8,788) (4,341)
Delivery and branch expenses 90,509 106,107 154,703 184,941
Depreciation and amortization expenses 6,725 6,217 13,491 12,375
General and administrative expenses 5,088 6,861 11,508 12,917
Finance charge income (1,014) (1,517) (1,535) (2,343)
Operating income 96,319 134,095 119,965 164,868
Interest expense, net (1,891) (3,816) (3,750) (7,276)
Amortization of debt issuance costs (315) (403) (627) (803)
Income before income taxes 94,113 129,876 115,588 156,789
Income tax expense 38,904 54,189 48,321 65,548
Net income 55,209 75,687 67,267 91,241
General Partner's interest in net income 313 428 381 516
Limited Partners' interest in net income $ 54,896 $ 75,259 $ 66,886 $ 90,725
Basic and diluted income per Limited Partner Unit [1] $ 0.79 $ 1.08 $ 0.98 $ 1.31
Weighted average number of Limited Partner units outstanding:        
Basic and Diluted 57,242 57,282 57,262 57,288
[1] See Note 13 Earnings Per Limited Partner Unit.