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Earnings Per Share and Capital Structure Stock Repurchase Plan (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended
	Mar. 08, 2013	Mar. 31, 2013	Mar. 31, 2013
Stock Repurchase Program, Authorized Amount	$ 50,000,000
Stock Repurchased and Retired During Period, Shares		4,490
Stock Repurchased and Retired During Period, Value		200,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 49,800,000

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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