Share-based Arrangements (Tables)

6 Months Ended

Jun. 29, 2018

Stock option activity was as follows:



	For the Three Months Ended				For the Six Months Ended
	June 29, 2018				June 29, 2018
	Options		Weighted - average exercise price		Options		Weighted - average exercise price
Options outstanding at beginning of period	1,042,136		$	44.90	925,385		$	40.43
Granted	—		$	—	199,510		$	62.46
Exercised	(76,701	)	$	34.55	(147,276	)	$	35.43
Forfeited or expired	—		$	—	(12,184	)	$	42.13
Options outstanding at June 29, 2018	965,435		$	45.73	965,435		$	45.73

Fair Value Assumptions

The fair value of each option award is estimated on the date of grant using the Black-Scholes option valuation model. The following table indicates the weighted-average assumptions used in estimating fair value:



	For the Six Months Ended
	June 29, 2018			June 30, 2017
Expected option term (years)	4.9			5.0
Expected volatility	18.1		%	19.9		%
Risk-free interest rate	2.6		%	1.9		%
Expected dividend yield	1.5		%	1.6		%
Per share fair value of options granted		$10.65			$8.61

Restricted Stock Award and Restricted Stock Unit Activity

Restricted stock award and restricted stock unit activity was as follows:



	For the Three Months Ended				For the Six Months Ended
	June 29, 2018				June 29, 2018
	Restricted Stock		Weighted- average grant date fair value		Restricted Stock		Weighted- average grant date fair value
Restricted Stock outstanding at beginning of period	153,269		$	49.98	154,882		$	44.50
Granted	17,757		$	63.37	60,247		$	62.73
Vested	(19,105	)	$	62.32	(61,466	)	$	48.76
Forfeited or expired	(695	)	$	55.75	(2,437	)	$	48.36
Restricted Stock outstanding at June 29, 2018	151,226		$	49.96	151,226		$	49.96