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Common Stock and Treasury Stock
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Common Stock and Treasury Stock

7. Common Stock and Treasury Stock

As of December 31, 2011, the Company’s Board of Directors had approved a stock repurchase program authorizing the Company, from time to time as market and business conditions warrant, to acquire up to $210 million of its common stock. In February 2012, the Company’s Board of Directors approved an increase of $52.1 million to their current stock repurchase authorization, bringing the total authorization to $262.1 million.

On September 13, 2012, the Company’s Board of Directors approved the repurchase of up to 7,500,000 shares of the Company’s common stock, or up to $113.0 million in place of the remaining repurchase amounts previously authorized. In July 2013, the Company’s Board of Directors approved an additional $100 million for the stock repurchase program. In February 2014, the Company’s Board of Directors approved an additional $100 million for the stock repurchase program.

The Company repurchased 3,578,427 shares for $70.0 million under the program during the year ended December 31, 2014. Under the program to date, the Company has repurchased 37,108,467 shares for approximately $395.8 million. The maximum remaining authorized for purchase under the stock repurchase program was approximately $138.3 million as of December 31, 2014.

During the year ended September 30, 2006, the Company began to issue shares of treasury stock upon exercise of stock options, payment of earned performance shares, issuance of restricted stock awards and for issuances of common stock pursuant to the Company’s employee stock purchase plan. Treasury shares issued during the year ended December 31, 2012 included 2,541,903 and 679,782 shares issued pursuant to stock option exercises and restricted share award grants, respectively. Treasury shares issued during the year ended December 31, 2013 included 2,493,684, 25,989 and 982,728 shares issued pursuant to stock option exercises, Restricted share award (“RSA”) grants, and long-term incentive program performance share awards (“LTIP Performance Shares”) vesting, respectively. Treasury shares issued during the year ended December 31, 2014 included 2,037,467, 106,275 and 635,643 shares issued pursuant to stock option exercises, RSA grants, and LTIP Performance Shares vesting, respectively.