Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The following tables summarize option activity for the six-month period ended June 30, 2021:

						Weighted		Aggregate
				Weighted		Average		Intrinsic
				Average		Remaining		Value
	Options			Exercise Price		Contractual Life		(in 000’s)
Outstanding options at January 1, 2021		1,632,334		$	70.67
Options granted		213,271			109.81
Options exercised		(127,085	)		55.77
Options canceled/forfeited		(600	)		93.24
Outstanding options at June 30, 2021		1,717,920		$	76.62		5.22	$	49,473
Exercisable options at June 30, 2021		756,095		$	63.07		3.73	$	31,397

Summary of Weighted Average Grant-date Assumptions and Weighted Average Fair Values

The fair value of options was estimated using a Black-Scholes based option pricing model with the following weighted average grant-date assumptions and weighted average fair values as of June 30:

	2021			2020
Weighted-average fair value of grants	$	17.00		$	14.48
Risk-free interest rates		0.69	%		1.54	%
Dividend yield		2.07	%		2.69	%
Expected volatility		22.73	%		22.68	%
Expected option life		4.97	years		4.99	years

Schedule of Restricted Stock Units Activity

				Weighted
				Average
				Grant Date
	RSUs			Fair Value
Nonvested at January 1, 2021		47,658		$	81.53
Granted		16,780			113.02
Reinvested		212			106.60
Vested		(19,725	)		72.53
Forfeited		(86	)		101.41
Nonvested at June 30, 2021		44,839		$	97.35