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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sales:        
Product $ 156,229 $ 184,891 $ 813,519 $ 1,325,907
Installations and services 61,965 60,713 185,755 181,223
Total sales 218,194 245,604 999,274 1,507,130
Cost and expenses:        
Cost of product 103,568 133,053 473,534 905,117
Cost of installations and services 53,272 52,786 175,042 173,831
(Increase) decrease in fair value of derivative instruments (11,283) (5,415) (20,071) (9,756)
Delivery and branch expenses 64,052 64,575 218,755 249,516
Depreciation and amortization expenses 6,468 6,204 19,959 18,579
General and administrative expenses 6,017 6,173 17,525 19,090
Finance charge income (945) (1,699) (2,480) (4,042)
Operating income (loss) (2,955) (10,073) 117,010 154,795
Interest expense, net (1,731) (3,491) (5,481) (10,767)
Amortization of debt issuance costs (307) (406) (934) (1,209)
Income (loss) before income taxes (4,993) (13,970) 110,595 142,819
Income tax expense (benefit) (1,755) (5,611) 46,566 59,937
Net income (loss) (3,238) (8,359) 64,029 82,882
General Partner's interest in net income (loss) (19) (47) 362 469
Limited Partners' interest in net income (loss) $ (3,219) $ (8,312) $ 63,667 $ 82,413
Basic and diluted income (loss) per Limited Partner Unit [1] $ (0.06) $ (0.15) $ 0.95 $ 1.21
Weighted average number of Limited Partner units outstanding:        
Basic and Diluted 57,188 57,282 57,237 57,286
[1] See Note 13 Earnings Per Limited Partner Unit.