XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Stock-Based Compensation (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Activity in Corporation's Active Stock Plans |
|  | 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, 2017 |  | 53,659 |  |  | $ | 61.48 |  |  | 256,850 |  |  | $ | 73.43 |  |  | 43,860 |  |  | 69.70 |  |  | 4,089,028 |  |  | $ | 62.67 |
Authorized |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Granted |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised/vested |  | (1,180 | ) |  | 67.75 |  |  | (1,730 | ) |  | 76.07 |  |  | — |  |  | — |  |  | (439,144 | ) |  | 56.35 |
Forfeited/expired |  | — |  |  | — |  |  | (260 | ) |  | 76.07 |  |  | — |  |  | — |  |  | (20,656 | ) |  | 67.47 |
Balance, March 31, 2017 |  | 52,479 |  |  | $ | 61.34 |  |  | 254,860 |  |  | $ | 73.41 |  |  | 43,860 |  |  | 69.70 |  |  | 3,629,228 |  |  | $ | 63.41 |
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,
| 2017 |  | 2016
New shares issued from available authorized shares | 283,342 |  |  | — |
Issued from available treasury stock | 158,712 |  |  | 1,875 |
Total | 442,054 |  |  | 1,875 |
Proceeds from stock option exercises | $ | 24,747 |  |  | $ | 97 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] |
| Three Months Ended March 31,
| 2017 |  | 2016
Stock options | $ | 1,787 |  |  | $ | 2,125 |
Non-vested stock awards/stock units | 1,033 |  |  | 357 |
Director deferred stock units | — |  |  | — |
Performance stock units | 283 |  |  | — |
Total | $ | 3,103 |  |  | $ | 2,482 |
Income tax benefit | $ | 1,086 |  |  | $ | 869 |
Unrecognized Stock-Based Compensation Expense |
Stock options | $ | 10,439 |
Non-vested stock awards/stock units | 9,360 |
Performance stock units | 2,774 |
Total | $ | 22,573 |

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration