Derivative Financial Instruments (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Impact of the Partnership's derivative instruments on Condensed Consolidated Statements of Operations
Unrealized (loss) gain	$ (15,602,000)	$ 102,127,000	$ (4,147,000)
Derivative instruments not designated as hedging instruments
Impact of the Partnership's derivative instruments on Condensed Consolidated Statements of Operations
Total (loss) gain	(25,770,000)	69,126,000	(75,515,000)
Derivative instruments not designated as hedging instruments | Revenue: Derivative (loss) gain
Impact of the Partnership's derivative instruments on Condensed Consolidated Statements of Operations
Realized loss	(3,534,000)	(6,508,000)	(48,093,000)
Unrealized (loss) gain	(21,104,000)	63,043,000	19,058,000
Total (loss) gain	(24,638,000)	56,535,000	(29,035,000)
Amortization of premium payments	0	0	4,400,000
Derivative instruments not designated as hedging instruments | Derivative gain (loss) related to purchased product costs
Impact of the Partnership's derivative instruments on Condensed Consolidated Statements of Operations
Realized loss	(6,634,000)	(26,493,000)	(27,711,000)
Unrealized (loss) gain	8,371,000	40,455,000	(25,249,000)
Total (loss) gain	1,737,000	13,962,000	(52,960,000)
Derivative instruments not designated as hedging instruments | Derivative (loss) gain related to facility expenses
Impact of the Partnership's derivative instruments on Condensed Consolidated Statements of Operations
Unrealized (loss) gain	$ (2,869,000)	$ (1,371,000)	$ 6,480,000