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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Option Activity

The following table summarizes the Company’s stock option activity and related information for the 2011 Plan, the 2000 Plan and the Directors Plan for the three months ended March 31, 2019:

	Options			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life		Aggregate Intrinsic value (in thousands)
Outstanding at December 31, 2018	466,677			$	61.04			5.7		$	5,917
Granted	128,555			72.85						112
Exercised	(734	)		64.54						7
Canceled	(228	)		74.38						—
Outstanding at March 31, 2019	594,270			63.58				6.4		6,027
Exercisable at March 31, 2019	355,222			56.00				5.2		6,295

Share-Based Fair Value of Each Option Grant Weighted-Average Assumptions

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:

	Three Months Ended March 31,
	2019			2018
Dividend yield	0.66	%		0.33	%
Risk-free interest rate	2.63	%		2.70	%
Stock price volatility	25.8	%		23.9	%
Expected life (years)	5.0			5.0

Restricted Stock Activity and Incentive Stock Awards Activity

The following table summarizes the restricted stock activity and related information for the 2011 Plan, the 2000 Plan and the Directors Plan, and incentive stock units activity for the 2011 Plan and the 2000 Plan with related information for the three months ended March 31, 2019:

	Restricted Stock and Units			Incentive Stock Units			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2018	445,089			415,243			$	75.51
Granted	535,873			258,600			70.64
Vested	(105,651	)		(119,835	)		68.62
Adjustment for incentive stock awards expected to vest	—			18,398			81.20
Canceled	(6,733	)		(5,350	)		80.17
Outstanding at March 31, 2019	868,578			567,056			73.93

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- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
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-Name Accounting Standards Codification
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-Paragraph 2
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Schedule of Incentive Stock Awards Activity and Restricted Stock Activity [Table Text Block]

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