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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 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 |  |  | $ | 61.35 |  |  | 173,180 |  |  | $ | 66.05 |  |  | 5,612,240 |  |  | $ | 60.30 |
Authorized | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Stock options exercised | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,875 | ) |  | 51.21 |
Stock awards/units vested | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited/expired | 26,775 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (26,775 | ) |  | 70.55 |
Balance, March 31, 2016 | 1,616,502 |  |  | 45,443 |  |  | $ | 61.35 |  |  | 173,180 |  |  | $ | 66.05 |  |  | 5,583,590 |  |  | $ | 60.26 |
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 March 31,
| 2016 |  | 2015
New shares issued from available authorized shares | — |  |  | — |
Issued from available treasury stock | 1,875 |  |  | 14,350 |
Total | 1,875 |  |  | 14,350 |
Proceeds from stock option exercises | $ | 96 |  |  | $ | 728 |
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 March 31,
| 2016 |  | 2015
Stock options | $ | 2,125 |  |  | $ | 2,166 |
Non-vested stock awards/stock units | 357 |  |  | 396 |
Deferred stock units | — |  |  | — |
Total | $ | 2,482 |  |  | $ | 2,562 |
Unrecognized Stock-Based Compensation Expense | Unrecognized stock-based compensation expense at March 31, 2016 was as follows:
Stock options | $ | 18,759 |
Non-vested stock awards/stock units | 2,998 |
Total | $ | 21,757 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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