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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Activity in Corporation's Active Stock Plans | A combined summary of activity in the Corporation’s active stock plans is presented in the following table.
|  |  |  |  |  |  |  | Non-Vested Stock Awards/Stock Units Outstanding |  |  | Stock Options Outstanding |
|  | Shares Available for Grant |  |  | Director Deferred Stock Units Outstanding |  |  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value |  |  | Number of Shares |  |  | Weighted- Average Exercise Price |
Balance, January 1, 2013 |  |  | 1,157,413 |  |  |  | 27,724 |  |  |  | 188,560 |  |  | $ | 51.67 |  |  |  | 5,513,516 |  |  | $ | 51.94 |
Authorized |  |  | 2,293,660 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Granted |  |  | (5,500 | ) |  |  | 5,500 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Stock options exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (662,224 | ) |  |  | 51.63 |
Stock awards vested |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | 30,375 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (30,375 | ) |  |  | 51.32 |
Cancelled/expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance, June 30, 2013 |  |  | 3,475,948 |  |  |  | 33,224 |  |  |  | 188,560 |  |  | $ | 51.67 |  |  |  | 4,820,917 |  |  | $ | 51.99 |
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, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
New shares issued from available authorized shares |  |  | — |  |  |  | 31,511 |  |  |  | 153,275 |  |  |  | 132,671 |
Issued from available treasury stock |  |  | 266,799 |  |  |  | — |  |  |  | 508,949 |  |  |  | 7,640 |
Total |  |  | 266,799 |  |  |  | 31,511 |  |  |  | 662,224 |  |  |  | 140,311 |
Proceeds from stock option exercises |  | $ | 13,743 |  |  | $ | 1,669 |  |  | $ | 34,189 |  |  | $ | 7,211 |
Stock-Based Compensation Expense | Stock-based compensation expense was as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Stock options |  | $ | 1,968 |  |  | $ | 2,158 |  |  | $ | 3,966 |  |  | $ | 4,359 |
Non-vested stock awards/stock units |  |  | 345 |  |  |  | 355 |  |  |  | 689 |  |  |  | 709 |
Deferred stock units |  |  | 330 |  |  |  | 330 |  |  |  | 330 |  |  |  | 330 |
Total |  | $ | 2,643 |  |  | $ | 2,843 |  |  | $ | 4,985 |  |  | $ | 5,398 |
Unrecognized Stock-Based Compensation Expense | Unrecognized stock-based compensation expense at June 30, 2013 was as follows:
Stock options |  | $ | 13,374 |
Non-vested stock awards/stock units |  |  | 2,245 |
Total |  | $ | 15,619 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + 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 total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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