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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Sales:        
Product $ 208,862 $ 181,751 $ 1,396,281 $ 1,172,628
Installations and service 53,662 50,725 167,907 150,914
Total sales 262,524 232,476 1,564,188 1,323,542
Cost and expenses:        
Cost of product 163,515 146,034 1,091,918 921,931
Cost of installations and service 44,102 39,892 152,661 136,617
(Increase) decrease in fair value of derivative instruments 1,910 11,225 6,428 1,362
Delivery and branch expenses 53,798 46,760 205,507 176,230
Depreciation and amortization expenses 4,328 4,608 13,007 12,066
General and administrative expenses 4,557 4,008 13,809 13,927
Operating income (loss) (9,686) (20,051) 80,858 61,409
Interest expense (3,547) (3,435) (10,998) (10,716)
Interest income 1,696 1,538 4,978 3,474
Amortization of debt issuance costs (415) (486) (1,325) (1,145)
Income (loss) before income taxes (11,952) (22,434) 73,513 53,022
Income tax expense (benefit) (4,364) (10,645) 29,670 21,398
Net income (loss) (7,588) (11,789) 43,843 31,624
General Partner's interest in net income (loss) (41) (62) 237 166
Limited Partners' interest in net income (loss) $ (7,547) $ (11,727) $ 43,606 $ 31,458
Basic and Diluted income (loss) per Limited Partner Unit $ (0.13) [1] $ (0.19) [1] $ 0.63 [1] $ 0.46 [1]
Weighted average number of Limited Partner units outstanding:        
Basic and Diluted 59,370 61,024 59,918 62,236
[1] See Note 14 - Earnings (Loss) Per Limited Partner Unit.