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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
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 plans is presented in the table. Performance stock units outstanding are presented assuming attainment of the maximum payout rate as set forth by the performance criteria. As of June 30, 2019, there were 1,265,480 shares remaining available for grant for future stock-based compensation awards.
|  | Director Deferred Stock Units Outstanding |  | Non-Vested Stock Awards/Stock Units Outstanding |  | Performance Stock Units Outstanding |  | Stock Options Outstanding
|  | Number of Units |  | Weighted- Average Fair Value at Grant |  | Number of Shares/Units |  | Weighted- Average Fair Value at Grant |  | Number of Units |  | Weighted- Average Fair Value at Grant |  | Number of Shares |  | Weighted- Average Exercise Price
Balance, January 1, 2019 |  | 48,910 |  |  | $ | 71.14 |  |  | 383,797 |  |  | $ | 85.59 |  |  | 125,809 |  |  | $ | 82.55 |  |  | 2,352,008 |  |  | $ | 63.55 |
Authorized |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Granted |  | 7,592 |  |  | 102.70 |  |  | 1,957 |  |  | 91.96 |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised/vested |  | — |  |  | — |  |  | (17,800 | ) |  | 65.11 |  |  | — |  |  | — |  |  | (136,100 | ) |  | 57.61 |
Forfeited/expired |  | — |  |  | — |  |  | (3,877 | ) |  | 90.10 |  |  | — |  |  | — |  |  | (6,875 | ) |  | 65.11 |
Balance, June 30, 2019 |  | 56,502 |  |  | $ | 75.38 |  |  | 364,077 |  |  | $ | 86.58 |  |  | 125,809 |  |  | $ | 82.55 |  |  | 2,209,033 |  |  | $ | 63.91 |
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,
| 2019 |  | 2018 |  | 2019 |  | 2018
New shares issued from available authorized shares | — |  |  | — |  |  | — |  |  | — |
Issued from available treasury stock | 53,035 |  |  | 110,489 |  |  | 153,900 |  |  | 428,599 |
Total | 53,035 |  |  | 110,489 |  |  | 153,900 |  |  | 428,599 |
Proceeds from stock option exercises | $ | 2,956 |  |  | $ | 6,283 |  |  | $ | 7,841 |  |  | $ | 25,448 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | Stock-based compensation expense and the related income tax benefit is presented in the following table.
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Stock options | $ | 379 |  |  | $ | 1,019 |  |  | $ | 761 |  |  | $ | 2,104 |
Non-vested stock awards/stock units | 2,056 |  |  | 1,371 |  |  | 4,191 |  |  | 2,839 |
Director deferred stock units | 780 |  |  | 720 |  |  | 780 |  |  | 720 |
Performance stock units | 1,149 |  |  | 475 |  |  | 2,286 |  |  | 1,097 |
Total | $ | 4,364 |  |  | $ | 3,585 |  |  | $ | 8,018 |  |  | $ | 6,760 |
Income tax benefit | $ | 732 |  |  | $ | 753 |  |  | $ | 1,316 |  |  | $ | 1,420 |
Unrecognized Stock-Based Compensation Expense | Unrecognized stock-based compensation expense at June 30, 2019 is presented in the table below. Unrecognized stock-based compensation expense related to performance stock units is presented assuming attainment of the maximum payout rate as set forth by the performance criteria.
Stock options | $ | 465 |
Non-vested stock awards/stock units | 13,441 |
Performance stock units | 4,241 |
Total | $ | 18,147 |

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