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Shareholders' Equity Share Repurchase Plan Information (Details) (USD $)	1 Months Ended		15 Months Ended
	Oct. 24, 2011	Feb. 15, 2013	Dec. 31, 2012
Stock Repurchase Program, Authorized Amount	$ 100,000,000
Stock Repurchased and Retired During Period, Value		$ 0	$ 76,900,000

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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