Investment In Unconsolidated Affiliates (Changes In Partnership's Investment) (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011		Jun. 30, 2012	Jun. 30, 2011
Distributions received from unconsolidated affiliates				$ 63,096,000	$ 50,510,000
Share of unconsolidated affiliates' net income (loss)	34,185,000	32,167,000		66,143,000	55,975,000
HPC [Member]
Contributions to unconsolidated affiliates	0	0		0	0
Distributions received from unconsolidated affiliates	13,871,000	18,113,000		30,030,000	34,841,000
Share of unconsolidated affiliates' net income (loss)	13,108,000	15,130,000		24,417,000	30,205,000
Amortization of excess fair value of investment	(1,461,000)	(1,461,000)		(2,923,000)	(2,923,000)
MEP [Member]
Contributions to unconsolidated affiliates	0	0		0	0
Distributions received from unconsolidated affiliates	18,796,000	18,222,000		38,182,000	43,659,000
Share of unconsolidated affiliates' net income (loss)	10,189,000	10,110,000		20,936,000	20,305,000
Amortization of excess fair value of investment	0	0		0	0
Lone Star [Member]
Contributions to unconsolidated affiliates	95,414,000	591,681,000	[1]	175,254,000	591,681,000	[1]
Distributions received from unconsolidated affiliates	10,787,000	0	[1]	17,743,000	0	[1]
Share of unconsolidated affiliates' net income (loss)	12,366,000	8,388,000	[1]	23,730,000	8,388,000	[1]
Amortization of excess fair value of investment	0	0	[1]	0	0	[1]
Ranch JV [Member]
Contributions to unconsolidated affiliates	8,944,000			22,356,000
Distributions received from unconsolidated affiliates	0			0
Share of unconsolidated affiliates' net income (loss)	(17,000)			(17,000)
Amortization of excess fair value of investment	$ 0			$ 0

[1] (1)For the period from initial contribution, May 2, 2011, to June 30, 2011.