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Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2018

Stock Options Plan [Member]

Assumptions Used to Determine Grant-Date Fair Value of Options

The following weighted average assumptions were used to determine the grant-date fair value of options:

		2018				2017				2016
Dividend yield			1.11	%			0.96	%			1.38	%
Expected life			5 years				5 years				5 years
Volatility			25.6	%			25.3	%			25.1	%
Risk free interest rate			2.74	%			1.50	%			0.91	%

Summary of Transactions of Company's Stock Option Plans

The following table summarizes the transactions of the Company’s stock option plans for the year ended December 31, 2018:

		Number of Options				Weighted Average Exercise Price				Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2017			357,666			$	13.74			$	35.69
Granted – at discount			287,966			$	45.21			$	34.98
– at market value			18,850			$	68.20			$	16.23
Exercised			(103,562	)		$	11.00			$	29.78
Forfeited			(15,671	)		$	24.35			$	25.38
Outstanding at December 31, 2018			545,249			$	32.46			$	36.06

Stock Equivalent Units [Member]

Assumptions Used to Determine Fair Value of SEUs

The following assumptions were used to determine the fair value of SEUs at the balance sheet dates:

		2018				2017				2016
Dividend yield			1.44	%			1.09	%			0.98	%
Volatility			27.2	%			25.4	%			25.2	%
Risk free interest rate			2.46	%			1.98	%			1.47	%

Summarizes Transactions of SEUs

The following table summarizes the transactions of the Company’s SEUs for the year ended December 31, 2018:

		Number of SEUs				Weighted Average Exercise Price				Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2017			400,342			$	3.10			$	46.65
Granted – at discount			115,229			$	2.36			$	57.16
– at market value			5,658			$	68.20			$	16.23
Exercised			(78,239	)		$	5.40			$	30.44
Forfeited			(24,054	)		$	0.96			$	41.58
Outstanding at December 31, 2018			418,936			$	3.47			$	52.45

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