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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2013
Stockholders' Equity Note [Abstract] |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] |
| Common Stock
Share Activity | Treasury | Outstanding
| (Number of Shares)
Balance at end of 2010 | 814,249 | 10,277,138
Purchased through share repurchase program | 278,655 | (278,655)
Issued for stock-based compensation plans | (50,528) | 74,920
Balance at end of 2011 | 1,042,376 | 10,073,403
Issued for stock-based compensation plans | (75,995) | 75,995
Balance at end of 2012 | 966,381 | 10,149,398
Issued for stock-based compensation plans | (39,123) | 39,123
Balance at end of 2013 | 927,258 | 10,188,521

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