Long-Term Debt (Partnership's Senior Notes) (Details)	9 Months Ended		0 Months Ended			9 Months Ended
	Sep. 30, 2011	Jul. 15, 2019	Jul. 15, 2018 Senior Notes Due 2021 [Member]	Jul. 15, 2017 Senior Notes Due 2021 [Member]	Jul. 15, 2016 Senior Notes Due 2021 [Member]	Sep. 30, 2011 Senior Notes Due 2021 [Member]
Senior note redemption price, percentage of principal	101.00%		101.083%	102.167%	103.25%	106.50%
Redemption of senior notes percentage		100.00%