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Restructuring (Details) (USD $)	3 Months Ended		6 Months Ended
Restructuring (Details) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Restructuring and Related Activities [Abstract]
Gain on restructuring	$ 0	$ 0	$ 497,000	$ 1,888,000
Expected restructuring charges			$ 25,000,000

Amount expected to be charged against earnings in the current and future periods for the specified restructuring cost.

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- Definition

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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