Investment In Unconsolidated Affiliates (Changes In Partnership's Investment) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Distributions received from unconsolidated affiliates	$ 29,012,000	$ 25,270,000
Income (Loss) from Equity Method Investments	31,958,000	23,808,000
HPC [Member]
Investments in and Advances to Affiliates, at Fair Value, Gross Additions	0	0
Distributions received from unconsolidated affiliates	16,159,000	16,728,000
Income (Loss) from Equity Method Investments	11,309,000	15,075,000
Amortization of excess fair value of investment	(1,462,000)	(1,462,000)
MEP [Member]
Investments in and Advances to Affiliates, at Fair Value, Gross Additions	0	0
Distributions received from unconsolidated affiliates	19,386,000	25,437,000
Income (Loss) from Equity Method Investments	10,747,000	10,195,000
Amortization of excess fair value of investment	0	0
Lone Star [Member]
Investments in and Advances to Affiliates, at Fair Value, Gross Additions	79,840,000
Distributions received from unconsolidated affiliates	6,956,000
Income (Loss) from Equity Method Investments	11,364,000
Amortization of excess fair value of investment	0
Ranch JV [Member]
Investments in and Advances to Affiliates, at Fair Value, Gross Additions	13,412,000
Distributions received from unconsolidated affiliates	0
Income (Loss) from Equity Method Investments	0
Amortization of excess fair value of investment	$ 0