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Shareholders' Equity
 6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Shareholders' Equity
Shareholders’ equity

On July 24, 2013, we declared a quarterly cash dividend of $0.05 per common share payable in August 2013. This represents our first dividend declaration since November 2008. We also increased our common share repurchase authorization by $250.0 million, raising our total available repurchase authorization to $352.3 million of common shares. There have been no repurchases under our authorized stock repurchase programs since 2006.
 
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 the six months ended June 30, 2013 and 2012, we repurchased $6.4 million and $0.9 million, respectively, of shares from employees under these plans. Such repurchases are excluded from the above noted stock repurchase authorization.