Certain Provisions of the Partnership Agreement (Partnership Distributions) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended	3 Months Ended							9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2013	Sep. 30, 2013 Preferred Stock P I K [Member]	Jun. 30, 2013 Preferred Stock P I K [Member]	Mar. 31, 2013 Preferred Stock P I K [Member]	Sep. 30, 2013 Twenty Eighteen [Member] Unsecured Debt [Member] Eight Point Eight Seven Five Percent [Member]	Dec. 31, 2012 Twenty Eighteen [Member] Unsecured Debt [Member] Eight Point Eight Seven Five Percent [Member]	Sep. 30, 2013 Twenty Twentytwo [Member] Unsecured Debt [Member] Seven Point One Two Five Percent [Member]	Dec. 31, 2012 Twenty Twentytwo [Member] Unsecured Debt [Member] Seven Point One Two Five Percent [Member]	Sep. 30, 2013 General Partner [Member] Thirteen Percent [Member]	Sep. 30, 2013 General Partner [Member] Twentythree Percent [Member]	Sep. 30, 2013 General Partner [Member] Fortyeight Percent [Member]
Distribution Made to Member or Limited Partner [Line Items]
Distribution Made to Limited Partner, Distribution Date	Aug. 12, 2013	May 13, 2013	Feb. 14, 2013	Nov. 12, 2013
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 0.33	$ 0.33	$ 0.33
Percentage bearing fixed interest rate								8.875%	8.875%	7.125%	7.125%
Percentage Of Cash Avaliable For Distribution	100.00%			100.00%
Number Of Days From End Of Quarter For Distribution				45 days
Incentive Distribution Percentage Levels												13.00%	23.00%	48.00%
Incentive Distibution Excess Per Unit Amount												$ 0.25	$ 0.3125	$ 0.375
Incentive Distribution, Distribution	$ 1.3			$ 4.2
Preferred Stock Paid In Kind					394,313	384,731	375,382
Distribution Made to Member or Limited Partner, Distributions Declared, Per Unit				$ 0.34