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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.