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Goodwill (Narrative) (Details) (USD $)	3 Months Ended			12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Jun. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill, Impaired [Abstract]
Impairments	$ (240,500,000)	$ (654,900,000)	$ (1,400,000)	$ 0	$ (240,541,000)	$ (656,298,000)
Disposals			(1,593,000)			(1,593,000)
Goodwill, Impaired, Accumulated Impairment Loss				$ 1,800,000,000

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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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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Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.

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