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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

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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

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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.

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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

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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)
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