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Common Unit Repurchase and Retirement (Details Textual) (USD $)	1 Months Ended		3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended		3 Months Ended		12 Months Ended			36 Months Ended	1 Months Ended			3 Months Ended	12 Months Ended
	Feb. 29, 2012	Dec. 31, 2011	Jun. 30, 2010	Sep. 30, 2011	Jul. 31, 2009 Plan I [Member]	Jun. 30, 2010 Plan I [Member]	Feb. 29, 2012 Plan II [Member]	Jul. 31, 2010 Plan II [Member]	Mar. 31, 2012 Plan II [Member]	Dec. 31, 2011 Plan II [Member]	Sep. 30, 2012 Plan II [Member]	Sep. 30, 2011 Plan II [Member]	Sep. 30, 2010 Plan II [Member]	Sep. 30, 2012 Plan II [Member]	Sep. 30, 2012 Plan III [Member]	Aug. 31, 2012 Plan III [Member]	Jul. 31, 2012 Plan III [Member]	Sep. 30, 2012 Plan III [Member]	Sep. 30, 2012 Plan III [Member]
Common Unit Repurchase and Retirement (Textual) [Abstract]
Partnership's common units authorized for repurchase					7,500,000			7,000,000									3,000,000
Repurchase of common units						7,500,000	7,250,000
Common Unit Repurchase and Retirement (Additional Textual) [Abstract]
Average Price Paid per Unit	$ 4.94		$ 4.04						$ 4.62	$ 5.17	$ 4.96	$ 5.19	$ 4.44	$ 4.94	$ 4.25	$ 4.26		$ 4.26	$ 4.26
Additional partnership's common units authorized for repurchase		250,000
Number of repurchased units acquired in private sale		1,750,000		1,500,000