Consolidated Statements Of Comprehensive Income (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 110,240	$ 56,637	$ 303,304	$ 223,623
Other comprehensive income:
Net gain (loss) on commodity hedges	6,539	(179)	11,152	(468)
Reclassification of net gain on interest rate cash flow hedges to interest expense	(41)	(41)	(123)	(123)
Reclassification of net loss (gain) on commodity hedges to product sales revenues	(1,493)	(1,068)	(1,493)	967
Settlement cost and amortization of prior service credit and actuarial loss	701	101	856	80
Adjustment to recognize the funded status of postretirement plans	(10,254)	(2,167)	(10,254)	(2,167)
Total other comprehensive income (loss)	(4,548)	(3,354)	138	(1,711)
Comprehensive income	105,692	53,283	303,442	221,912
Comprehensive loss attributable to non-controlling owners' interest in consolidated subsidiaries		(154)	(63)	(222)
Comprehensive income attributable to partners' capital	$ 105,692	$ 53,437	$ 303,505	$ 222,134