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Common Stock	3 Months Ended
Common Stock	Mar. 31, 2013
Common Stock [Abstract]
Common Stock	Common Stock During the first three months of 2013, the Company repurchased 2.7 million shares of its common stock for consideration of $100 million. The Company remains authorized to purchase additional shares of its common stock up to a value of $223 million. The Company did not repurchase any shares in the first quarter of 2012.