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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2013
Subsequent Events [Abstract]
Subsequent Event [Text Block]	Subsequent Event Stock Repurchases Subsequent to March 31, 2013, we repurchased 65,339 shares of our common stock under the stock repurchase program authorized by the Board of Directors on March 8, 2013. The average price paid per share was $43.34.