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Shareholders' Equity
 12 Months Ended
Dec. 31, 2013
Stockholders' Equity Note [Abstract]  
Shareholders' equity
Shareholders’ equity

We reinstated our quarterly cash dividend in July 2013. During 2013, we declared three cash dividends of $0.05 per common share each.

In July 2013, we increased our common share repurchase authorization to $352.3 million of common shares. In 2013, we repurchased 7.2 million shares under the repurchase authorization for a total of $118.1 million. There were no repurchases under these programs during 2012 or 2011. At December 31, 2013, we had remaining authorization to purchase $234.3 million of common shares.

Under our stock-based compensation plans, we accept shares as payment under certain conditions related to stock option exercises and vesting of restricted stock, generally related to the payment of minimum tax obligations. During 2013, 2012, and 2011, employees surrendered shares valued at $9.6 million, $1.0 million, and $2.8 million, respectively, under these plans. Such share transactions are excluded from the above noted share repurchase authorization.