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Share Repurchase Program
12 Months Ended
Dec. 31, 2011
Share Repurchase Program/Comprehensive Income [Abstract]  
Share Repurchase Program
(15) Share Repurchase Program

Under the authorization of the Company’s Board of Directors, the Company maintains an ongoing share repurchase program. On August 4, 2011, the Board of Directors authorized a $250,000 increase to the share repurchase program, bringing the total authorization to $650,000. The $650,000 authorization is for repurchases made from and after August 5, 2009. Pursuant to this share repurchase program, the Company repurchased 3,339,468, 3,748,669 and 2,713,567 shares of its common stock and placed them into treasury during the years ended December 31, 2011, 2010 and 2009, respectively, at an aggregate cost of $175,718, $138,540 and $69,751, respectively. As of December 31, 2011, the Company had remaining authorization to purchase up to an additional $298,589 of shares of its common stock under the share repurchase program.