Impairment Charges (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Impairment of Goodwill and Other Assets
Goodwill		$ 368,451
Investment in and advances to unconsolidated investees	103,824	41,437	143,640
Notes receivable	22,608	2,857
Other assets			20,004
Total impairment of goodwill and other assets	$ 23,896	$ 824,314	$ 331,592

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details