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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Stockholders' Equity [Abstract] |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] |
| Common Stock
Share Activity | Treasury | Outstanding
| (Number of Shares)
Balance at end of 2012 | 966,381 | 10,149,398
Issued for share-based compensation plans | (39,123) | 39,123
Balance at end of 2013 | 927,258 | 10,188,521
Issued for share-based compensation plans | (53,884) | 53,884
Balance at end of 2014 | 873,374 | 10,242,405
Issued for share-based compensation plans | (59,113) | 59,113
Repurchased common shares | 80,512 | (80,512)
Balance at end of 2015 | 894,773 | 10,221,006

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