Unconsolidated Investees (Details 5) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Other unconsolidated investees, investment in and advances to entities
Investments in and advances to unconsolidated investees	$ 2,900,646	$ 2,024,661
Other Unconsolidated Investees [Member]
Other unconsolidated investees, investment in and advances to entities
Investments in and advances to unconsolidated investees	386,601	134,645
Other Unconsolidated Investees [Member] | Europe [Member]
Other unconsolidated investees, investment in and advances to entities
Estimated total investment to complete existing development	42,764	49,857
Other Unconsolidated Investees [Member] | Asia [Member]
Other unconsolidated investees, investment in and advances to entities
Estimated total investment to complete existing development	31,206	67,280
Other Unconsolidated Investees [Member] | Americas [Member]
Other unconsolidated investees, investment in and advances to entities
Estimated total investment to complete existing development	$ 312,631	$ 17,508