Net Income Per Limited Partner Unit (Details 2) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Diluted Net Income per Limited Partner Unit (prior period adjusted for stock split)
Basic net income per limited partner unit impact (in dollars per unit)	$ (0.12)	$ (0.04)	$ (0.14)
Diluted net income per limited partner unit impact (in dollars per unit)	$ (0.12)	$ (0.04)	$ (0.14)