Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2019

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

Schedule of Stock Valuation Assumptions

The following assumptions were used in the valuation of stock options granted in 2019:

	2019
Expected volatility	26.7%
Risk-free interest rate range	2.47% to 2.70%
Expected life in years	6.6
Expected dividend yield	—

Stock Option Transactions for Employee Stock Option Plans

Stock option transactions for the first quarter of 2019 are summarized as follows:

	2019
	First Quarter
	Shares		Weighted Average Exercise Price
Beginning balance	2,064,740		$	104.66
Granted	390,789		$	217.58
Exercised	(120,783	)	$	84.76
Canceled	(17,223	)	$	171.49
Ending balance	2,317,523		$	124.24
Options exercisable at end of period	1,549,179		$	79.52

Schedule of Restricted Stock Activity

The following table shows the restricted stock activity for the first three months of 2019:

	Shares		Weighted average fair value per share
Balance, December 30, 2018	74,220		$	108.05
Granted	17,522		$	200.00
Vested	(35,330	)	$	72.91
Balance, March 31, 2019	56,412		$	158.62