Earnings per Unit (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 10,933,000	$ (18,397,000)
Undistributed Earnings Allocated to Participating Securities	(49,000)
Limited Partners' Capital Account, Units Outstanding		0
Stock Issued During Period, Shares, New Issues			0
Incentive Distribution, Distribution	0
Common Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distribution Made to Limited Partner, Cash Distribution Declared	(5,491,000)
Limited Partner Distributions	5,491,000
Weighted Average Number of Shares Outstanding, Basic	22,811,000
Weighted Average Number of Shares Outstanding, Diluted	22,815,000
Earnings Per Share, Basic	$ 0.24
Earnings Per Share, Diluted	$ 0.24
Common Units [Member] | Limited Partner [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Undistributed Earnings Allocated to Participating Securities	(25,000)
Participating Securities, Distributed and Undistributed Earnings	5,466,000
Subordinated Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distribution Made to Limited Partner, Cash Distribution Declared	(5,491,000)
Limited Partner Distributions	5,491,000
Weighted Average Number of Shares Outstanding, Basic and Diluted	22,811,000
Earnings Per Share, Basic and Diluted	$ 0.24
Weighted Average Number Diluted Shares Outstanding Adjustment	0
Subordinated Units [Member] | Limited Partner [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Undistributed Earnings Allocated to Participating Securities	(24,000)
Participating Securities, Distributed and Undistributed Earnings	$ 5,467,000