Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012 item	Sep. 30, 2011	Sep. 30, 2012 item	Sep. 30, 2011
Income Taxes
Number of key elements of which income tax expense is comprised	2		2
Income tax benefit (provision)	$ (41,184)	$ 30,202	$ (27,972)	$ 107,382
Impairment charges	$ 1,066,754		$ 1,066,754

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

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

+ References+ Details