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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Basic and Diluted Earnings Per Limited Partner:        
Net income (loss) $ (11,789) $ (18,197) $ 31,624 $ 51,042
Less General Partners' interest in net income (loss) (62) (88) 166 247
Net income (loss) available to limited partners (11,727) (18,109) 31,458 50,795
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60     3,141 6,702
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 $ (11,727) $ (18,109) $ 28,317 $ 44,093
Per unit data:        
Basic and diluted net income (loss) available to limited partners (0.19) (0.27) 0.51 0.76
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60     0.05 0.10
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 (0.19) [1] (0.27) [1] 0.46 [1] 0.66 [1]
Weighted average number of Limited Partner units outstanding 61,024 67,078 62,236 67,078
[1] See Note 3 Summary of Significant Accounting Policies - Net Income (Loss) per Limited Partner Unit.