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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Activity in Corporation's Active Stock Plans | A combined summary of activity in our active stock-based compensation plans is presented in the following table.
|  |  | Director Deferred Stock Units Outstanding |  | Non-Vested Stock Awards/Stock Units Outstanding |  | Stock Options Outstanding
| Shares Available for Grant |  | Number of Shares |  | Weighted- Average Grant-Date Fair Value |  | Number of Shares |  | Weighted- Average Grant-Date Fair Value |  | Number of Shares |  | Weighted- Average Exercise Price
Balance, January 1, 2016 | 1,589,727 |  |  | 45,443 |  |  | $ | 61.16 |  |  | 173,180 |  |  | $ | 66.05 |  |  | 5,612,240 |  |  | $ | 60.30 |
Authorized | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Granted | (8,216 | ) |  | 8,216 |  |  | 63.25 |  |  | — |  |  | — |  |  | — |  |  | — |
Stock options exercised | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (67,075 | ) |  | 53.46 |
Stock awards/units vested | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited/expired | 39,192 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (39,192 | ) |  | 70.84 |
Balance, June 30, 2016 | 1,620,703 |  |  | 53,659 |  |  | $ | 61.48 |  |  | 173,180 |  |  | $ | 66.05 |  |  | 5,505,973 |  |  | $ | 60.31 |
Shares Issued in Connection with Stock Compensation Awards | Shares issued in connection with stock compensation awards along with other related information were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
New shares issued from available authorized shares | — |  |  | — |  |  | — |  |  | — |
Issued from available treasury stock | 65,200 |  |  | 157,124 |  |  | 67,075 |  |  | 171,474 |
Total | 65,200 |  |  | 157,124 |  |  | 67,075 |  |  | 171,474 |
Proceeds from stock option exercises | $ | 3,490 |  |  | $ | 8,222 |  |  | $ | 3,586 |  |  | $ | 8,950 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | Stock-based compensation expense was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Stock options | $ | 2,117 |  |  | $ | 2,028 |  |  | $ | 4,242 |  |  | $ | 4,194 |
Non-vested stock awards/stock units | 358 |  |  | 267 |  |  | 715 |  |  | 663 |
Deferred stock units | 520 |  |  | 480 |  |  | 520 |  |  | 480 |
Total | $ | 2,995 |  |  | $ | 2,775 |  |  | $ | 5,477 |  |  | $ | 5,337 |
Unrecognized Stock-Based Compensation Expense | Unrecognized stock-based compensation expense at June 30, 2016 was as follows:
Stock options | $ | 16,517 |
Non-vested stock awards/stock units | 2,640 |
Total | $ | 19,157 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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