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Shareholders' Equity	3 Months Ended
Shareholders' Equity	Mar. 31, 2012
Stockholders' Equity Note [Abstract]
Stockholders' Equity [Text Block]	Shareholders' Equity Share-Repurchase Program During 2011, the company's Board of Directors approved the repurchase of up to $250,000 of the company's common stock through two share-repurchase programs. As of March 31, 2012, the company repurchased 4,482,609 shares under these programs with a market value of $149,698 at the dates of repurchase.