Investment In Unconsolidated Affiliates Carrying Value of Unconsolidated Affiliates (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investment in unconsolidated affiliates, carrying value	$ 2,156,135	$ 1,924,705
HPC [Member]
Investment in unconsolidated affiliates, carrying value	658,869	682,046
MEP [Member]
Investment in unconsolidated affiliates, carrying value	588,800	613,942
Lone Star [Member]
Investment in unconsolidated affiliates, carrying value	876,133	628,717
Ranch JV [Member]
Investment in unconsolidated affiliates, carrying value	$ 32,333	$ 0