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Common Stock Activity (Tables) | 3 Months Ended
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Mar. 31, 2013
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
Schedule of Share Activity | A summary of share activity for the periods indicated, which may contain summation differences due to rounding, is as follows (in thousands):
| Common Shares Outstanding |  | Treasury Shares
Balance as of December 31, 2012 | 76,448 |  |  | 9,467 |
Shares issued for stock option exercises | 194 |  |  |
Shares issued for restricted stock awards | 21 |  |  |
Other shares issued | 125 |  |  |
Balance as of March 31, 2013 | 76,789 |  |  | 9,467 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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