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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sales:        
Product $ 158,531 $ 156,229 $ 950,307 $ 813,519
Installations and services 67,270 61,965 191,664 185,755
Total sales 225,801 218,194 1,141,971 999,274
Cost and expenses:        
Cost of product 104,268 103,568 592,802 473,534
Cost of installations and services 58,224 53,272 183,137 175,042
(Increase) decrease in fair value of derivative instruments [1] 3,135 (11,283) 7,026 (20,071)
Delivery and branch expenses 67,640 64,052 240,987 218,755
Depreciation and amortization expenses 7,418 6,468 20,705 19,959
General and administrative expenses 6,235 6,017 18,144 17,525
Finance charge income (1,308) (945) (3,288) (2,480)
Operating income (loss) (19,811) (2,955) 82,458 117,010
Interest expense, net (1,619) (1,731) (5,118) (5,481)
Amortization of debt issuance costs (336) (307) (972) (934)
Income (loss) before income taxes (21,766) (4,993) 76,368 110,595
Income tax expense (benefit) (8,434) (1,755) 31,721 46,566
Net income (loss) (13,332) (3,238) 44,647 64,029
General Partner's interest in net income (loss) (79) (19) 259 362
Limited Partners' interest in net income (loss) $ (13,253) $ (3,219) $ 44,388 $ 63,667
Basic and diluted income (loss) per Limited Partner Unit [2] $ (0.24) $ (0.06) $ 0.70 $ 0.95
Weighted average number of Limited Partner units outstanding:        
Basic and Diluted 55,888 57,188 55,888 57,237
[1] Represents the change in value of unrealized open positions and expired options.
[2] See Note 13 Earnings Per Limited Partner Unit.